Annual report [Section 13 and 15(d), not S-K Item 405]

Note 7 - Stockholders' Equity and Equity-linked Instruments - Schedule of Stock by Class (Details)

v3.26.1
Note 7 - Stockholders' Equity and Equity-linked Instruments - Schedule of Stock by Class (Details) - USD ($)
 1 Months Ended 12 Months Ended
Oct. 22, 2025
Jul. 11, 2025
Jan. 31, 2025
Dec. 31, 2025
Dec. 31, 2024
Nov. 30, 2023
Aug. 23, 2023
Shares Purchased/ Issued in Exchange (in shares)     547   547    
Preferred Stock, Shares Outstanding (in shares)       98,636 17,499    
Gross Proceeds       $ 35,615,000      
Fees $ 1,372,000     4,420,000      
Net Proceeds       $ 31,195,000      
Warrants Issued With Placement Agent Agreement [Member]              
Placement Agent Warrants (in shares) [1]       3,000      
Preferred Stock Converted to Preferred Stock [Member]              
Shares Purchased/ Issued in Exchange (in shares) [2]       3,454,420      
Conversions / Exchanges (in shares)       (3,355,784)      
Converted to Common stock (in shares)       3,355,784      
Preferred Stock Converted to Common Stock [Member]              
Conversions / Exchanges (in shares)       (99,000)      
Original (in shares)       426,000      
Conversion of preferred stock to common stock (in shares) [3]       (327,000)      
Converted to Common stock (in shares)       99,000      
Series A Preferred Stock [Member]              
Conversion Prices (in dollars per share) [4],[5],[6],[7]       $ 5,956.8      
Preferred Stock, Shares Outstanding (in shares)       0      
Gross Proceeds       $ 5,359,000      
Fees       697,000      
Net Proceeds       $ 4,662,000      
Series A Preferred Stock [Member] | Warrants Issued With Placement Agent Agreement [Member]              
Placement Agent Warrants (in shares) [1]       0      
Series A Preferred Stock [Member] | Preferred Stock Converted to Preferred Stock [Member]              
Shares Purchased/ Issued in Exchange (in shares) [2]       5,359      
Conversions / Exchanges (in shares)       (5,359)      
Converted to Common stock (in shares)       5,359      
Series A Preferred Stock [Member] | Preferred Stock Converted to Common Stock [Member]              
Conversions / Exchanges (in shares)       0      
Original (in shares)       1,000      
Conversion of preferred stock to common stock (in shares) [3]       (1,000)      
Converted to Common stock (in shares)       0      
Series A-2 Preferred Stock [Member]              
Conversion Prices (in dollars per share) [4],[5],[6],[7]       $ 6,379.2      
Preferred Stock, Shares Outstanding (in shares)       0      
Gross Proceeds       $ 1,297,000      
Fees       169,000      
Net Proceeds       $ 1,128,000      
Series A-2 Preferred Stock [Member] | Warrants Issued With Placement Agent Agreement [Member]              
Placement Agent Warrants (in shares) [1]       0      
Series A-2 Preferred Stock [Member] | Preferred Stock Converted to Preferred Stock [Member]              
Shares Purchased/ Issued in Exchange (in shares) [2]       1,297      
Conversions / Exchanges (in shares)       (1,297)      
Converted to Common stock (in shares)       1,297      
Series A-2 Preferred Stock [Member] | Preferred Stock Converted to Common Stock [Member]              
Conversions / Exchanges (in shares)       0      
Original (in shares)       0      
Conversion of preferred stock to common stock (in shares) [3]       0      
Converted to Common stock (in shares)       0      
Series A-3 Preferred Stock [Member]              
Conversion Prices (in dollars per share) [4],[5],[6],[7]       $ 6,436.8      
Preferred Stock, Shares Outstanding (in shares)       0      
Gross Proceeds       $ 1,733,000      
Fees       225,000      
Net Proceeds       $ 1,508,000      
Series A-3 Preferred Stock [Member] | Warrants Issued With Placement Agent Agreement [Member]              
Placement Agent Warrants (in shares) [1]       0      
Series A-3 Preferred Stock [Member] | Preferred Stock Converted to Preferred Stock [Member]              
Shares Purchased/ Issued in Exchange (in shares) [2]       1,733      
Conversions / Exchanges (in shares)       (1,733)      
Converted to Common stock (in shares)       1,733      
Series A-3 Preferred Stock [Member] | Preferred Stock Converted to Common Stock [Member]              
Conversions / Exchanges (in shares)       0      
Original (in shares)       0      
Conversion of preferred stock to common stock (in shares) [3]       0      
Converted to Common stock (in shares)       0      
Series A-4 Preferred Stock [Member]              
Conversion Prices (in dollars per share) [4],[5],[6],[7]       $ 3,648      
Preferred Stock, Shares Outstanding (in shares)       0      
Gross Proceeds       $ 1,934,000      
Fees       251,000      
Net Proceeds       $ 1,683,000      
Series A-4 Preferred Stock [Member] | Warrants Issued With Placement Agent Agreement [Member]              
Placement Agent Warrants (in shares) [1]       0      
Series A-4 Preferred Stock [Member] | Preferred Stock Converted to Preferred Stock [Member]              
Shares Purchased/ Issued in Exchange (in shares) [2]       1,934      
Conversions / Exchanges (in shares)       (1,934)      
Converted to Common stock (in shares)       1,934      
Series A-4 Preferred Stock [Member] | Preferred Stock Converted to Common Stock [Member]              
Conversions / Exchanges (in shares)       0      
Original (in shares)       1,000      
Conversion of preferred stock to common stock (in shares) [3]       (1,000)      
Converted to Common stock (in shares)       0      
Series A-5 Preferred Stock [Member]              
Conversion Prices (in dollars per share) [4],[5],[6],[7]       $ 5,323.2      
Preferred Stock, Shares Outstanding (in shares)       0      
Gross Proceeds       $ 2,299,000      
Fees       299,000      
Net Proceeds       $ 2,000,000      
Series A-5 Preferred Stock [Member] | Warrants Issued With Placement Agent Agreement [Member]              
Placement Agent Warrants (in shares) [1]       0      
Series A-5 Preferred Stock [Member] | Preferred Stock Converted to Preferred Stock [Member]              
Shares Purchased/ Issued in Exchange (in shares) [2]       2,299      
Conversions / Exchanges (in shares)       (2,299)      
Converted to Common stock (in shares)       2,299      
Series A-5 Preferred Stock [Member] | Preferred Stock Converted to Common Stock [Member]              
Conversions / Exchanges (in shares)       0      
Original (in shares)       0      
Conversion of preferred stock to common stock (in shares) [3]       0      
Converted to Common stock (in shares)       0      
Series A A Preferred Stock [Member]              
Conversion Prices (in dollars per share) [4],[5],[6],[7]       $ 4,526.4      
Preferred Stock, Shares Outstanding (in shares)       50   7,322 10,706
Gross Proceeds       $ 7,680,000      
Fees       966,000      
Net Proceeds       $ 6,714,000      
Price As Adjusted, Conversions (in dollars per share)       $ 907.2      
Series A A Preferred Stock [Member] | Warrants Issued With Placement Agent Agreement [Member]              
Placement Agent Warrants (in shares) [1]       0      
Series A A Preferred Stock [Member] | Preferred Stock Converted to Preferred Stock [Member]              
Shares Purchased/ Issued in Exchange (in shares) [2]       7,680      
Conversions / Exchanges (in shares)       (7,630)      
Converted to Common stock (in shares)       7,630      
Series A A Preferred Stock [Member] | Preferred Stock Converted to Common Stock [Member]              
Conversions / Exchanges (in shares)       (1,000)      
Original (in shares)       9,000      
Conversion of preferred stock to common stock (in shares) [3]       (8,000)      
Converted to Common stock (in shares)       1,000      
Series AA-2 Convertible Preferred Stock [Member]              
Conversion Prices (in dollars per share) [4],[5],[6],[7]       $ 5,006.4      
Preferred Stock, Shares Outstanding (in shares)       0      
Gross Proceeds       $ 1,500,000      
Fees       130,000      
Net Proceeds       $ 1,370,000      
Price As Adjusted, Conversions (in dollars per share)       $ 1,003.2      
Series AA-2 Convertible Preferred Stock [Member] | Warrants Issued With Placement Agent Agreement [Member]              
Placement Agent Warrants (in shares) [1]       0      
Series AA-2 Convertible Preferred Stock [Member] | Preferred Stock Converted to Preferred Stock [Member]              
Shares Purchased/ Issued in Exchange (in shares) [2]       1,500      
Conversions / Exchanges (in shares)       (1,500)      
Converted to Common stock (in shares)       1,500      
Series AA-2 Convertible Preferred Stock [Member] | Preferred Stock Converted to Common Stock [Member]              
Conversions / Exchanges (in shares)       0      
Original (in shares)       2,000      
Conversion of preferred stock to common stock (in shares) [3]       (2,000)      
Converted to Common stock (in shares)       0      
Series AA-3 Convertible Preferred Stock [Member]              
Conversion Prices (in dollars per share) [4],[5],[6],[7]       $ 4,560      
Preferred Stock, Shares Outstanding (in shares)       0      
Gross Proceeds       $ 1,025,000      
Fees       133,000      
Net Proceeds       $ 892,000      
Price As Adjusted, Conversions (in dollars per share)       $ 912      
Series AA-3 Convertible Preferred Stock [Member] | Warrants Issued With Placement Agent Agreement [Member]              
Placement Agent Warrants (in shares) [1]       0      
Series AA-3 Convertible Preferred Stock [Member] | Preferred Stock Converted to Preferred Stock [Member]              
Shares Purchased/ Issued in Exchange (in shares) [2]       1,025      
Conversions / Exchanges (in shares)       (1,025)      
Converted to Common stock (in shares)       1,025      
Series AA-3 Convertible Preferred Stock [Member] | Preferred Stock Converted to Common Stock [Member]              
Conversions / Exchanges (in shares)       0      
Original (in shares)       1,000      
Conversion of preferred stock to common stock (in shares) [3]       (1,000)      
Converted to Common stock (in shares)       0      
Series AA-4 Convertible Preferred Stock [Member]              
Conversion Prices (in dollars per share) [4],[5],[6],[7]       $ 4,454.4      
Preferred Stock, Shares Outstanding (in shares)       0      
Gross Proceeds       $ 1,026,000      
Fees       133,000      
Net Proceeds       $ 893,000      
Price As Adjusted, Conversions (in dollars per share)       $ 892.8      
Series AA-4 Convertible Preferred Stock [Member] | Warrants Issued With Placement Agent Agreement [Member]              
Placement Agent Warrants (in shares) [1]       0      
Series AA-4 Convertible Preferred Stock [Member] | Preferred Stock Converted to Preferred Stock [Member]              
Shares Purchased/ Issued in Exchange (in shares) [2]       1,026      
Conversions / Exchanges (in shares)       (1,026)      
Converted to Common stock (in shares)       1,026      
Series AA-4 Convertible Preferred Stock [Member] | Preferred Stock Converted to Common Stock [Member]              
Conversions / Exchanges (in shares)       0      
Original (in shares)       1,000      
Conversion of preferred stock to common stock (in shares) [3]       (1,000)      
Converted to Common stock (in shares)       0      
Series AA-5 Convertible Preferred Stock [Member]              
Conversion Prices (in dollars per share) [4],[5],[6],[7]       $ 5,088      
Preferred Stock, Shares Outstanding (in shares)       0      
Gross Proceeds       $ 550,000      
Fees       72,000      
Net Proceeds       $ 478,000      
Price As Adjusted, Conversions (in dollars per share)       $ 1,017.6      
Series AA-5 Convertible Preferred Stock [Member] | Warrants Issued With Placement Agent Agreement [Member]              
Placement Agent Warrants (in shares) [1]       0      
Series AA-5 Convertible Preferred Stock [Member] | Preferred Stock Converted to Preferred Stock [Member]              
Shares Purchased/ Issued in Exchange (in shares) [2]       550      
Conversions / Exchanges (in shares)       (550)      
Converted to Common stock (in shares)       550      
Series AA-5 Convertible Preferred Stock [Member] | Preferred Stock Converted to Common Stock [Member]              
Conversions / Exchanges (in shares)       0      
Original (in shares)       1,000      
Conversion of preferred stock to common stock (in shares) [3]       (1,000)      
Converted to Common stock (in shares)       0      
Series AAA Convertible Preferred Stock [Member]              
Conversion Prices (in dollars per share) [4],[5],[6],[7]       $ 801.6      
Preferred Stock, Shares Outstanding (in shares)       0      
Gross Proceeds       $ 5,377,000      
Fees       645,000      
Net Proceeds       $ 4,732,000      
Price As Adjusted, Conversions (in dollars per share)       $ 240.96      
Series AAA Convertible Preferred Stock [Member] | Warrants Issued With Placement Agent Agreement [Member]              
Placement Agent Warrants (in shares) [1]       2,000      
Series AAA Convertible Preferred Stock [Member] | Preferred Stock Converted to Preferred Stock [Member]              
Shares Purchased/ Issued in Exchange (in shares) [2]       9,388      
Conversions / Exchanges (in shares)       (9,388)      
Converted to Common stock (in shares)       9,388      
Series AAA Convertible Preferred Stock [Member] | Preferred Stock Converted to Common Stock [Member]              
Conversions / Exchanges (in shares)       0      
Original (in shares)       39,000      
Conversion of preferred stock to common stock (in shares) [3]       (39,000)      
Converted to Common stock (in shares)       0      
Series AAA-2 Convertible Preferred Stock [Member]              
Conversion Prices (in dollars per share) [4],[5],[6],[7]       $ 820.8      
Preferred Stock, Shares Outstanding (in shares)       20      
Gross Proceeds       $ 2,978,000      
Fees       357,000      
Net Proceeds       $ 2,621,000      
Price As Adjusted, Conversions (in dollars per share)       $ 246.24      
Series AAA-2 Convertible Preferred Stock [Member] | Warrants Issued With Placement Agent Agreement [Member]              
Placement Agent Warrants (in shares) [1]       1,000      
Series AAA-2 Convertible Preferred Stock [Member] | Preferred Stock Converted to Preferred Stock [Member]              
Shares Purchased/ Issued in Exchange (in shares) [2]       5,334      
Conversions / Exchanges (in shares)       (5,314)      
Converted to Common stock (in shares)       5,314      
Series AAA-2 Convertible Preferred Stock [Member] | Preferred Stock Converted to Common Stock [Member]              
Conversions / Exchanges (in shares)       0      
Original (in shares)       7,000      
Conversion of preferred stock to common stock (in shares) [3]       (7,000)      
Converted to Common stock (in shares)       0      
Series AAA Junior Preferred Stock [Member]              
Conversion Prices (in dollars per share) [4],[5],[6],[7]       $ 600      
Preferred Stock, Shares Outstanding (in shares)       0      
Gross Proceeds       $ 1,210,000      
Fees       145,000      
Net Proceeds       $ 1,065,000      
Price As Adjusted, Conversions (in dollars per share)       $ 180      
Series AAA Junior Preferred Stock [Member] | Warrants Issued With Placement Agent Agreement [Member]              
Placement Agent Warrants (in shares) [1]       0      
Series AAA Junior Preferred Stock [Member] | Preferred Stock Converted to Preferred Stock [Member]              
Shares Purchased/ Issued in Exchange (in shares) [2]       1,210      
Conversions / Exchanges (in shares)       (1,210)      
Converted to Common stock (in shares)       1,210      
Series AAA Junior Preferred Stock [Member] | Preferred Stock Converted to Common Stock [Member]              
Conversions / Exchanges (in shares)       0      
Original (in shares)       7,000      
Conversion of preferred stock to common stock (in shares) [3]       (7,000)      
Converted to Common stock (in shares)       0      
Series AAA-2 Junior Convertible Preferred Stock [Member]              
Conversion Prices (in dollars per share) [4],[5],[6],[7]       $ 600      
Preferred Stock, Shares Outstanding (in shares)       0      
Gross Proceeds       $ 551,000      
Fees       66,000      
Net Proceeds       $ 485,000      
Price As Adjusted, Conversions (in dollars per share)       $ 180      
Series AAA-2 Junior Convertible Preferred Stock [Member] | Warrants Issued With Placement Agent Agreement [Member]              
Placement Agent Warrants (in shares) [1]       0      
Series AAA-2 Junior Convertible Preferred Stock [Member] | Preferred Stock Converted to Preferred Stock [Member]              
Shares Purchased/ Issued in Exchange (in shares) [2]       551      
Conversions / Exchanges (in shares)       (551)      
Converted to Common stock (in shares)       551      
Series AAA-2 Junior Convertible Preferred Stock [Member] | Preferred Stock Converted to Common Stock [Member]              
Conversions / Exchanges (in shares)       0      
Original (in shares)       3,000      
Conversion of preferred stock to common stock (in shares) [3]       (3,000)      
Converted to Common stock (in shares)       0      
Series AAA-3 Junior Preferred Stock [Member]              
Conversion Prices (in dollars per share) [4],[5],[6],[7]       $ 600      
Preferred Stock, Shares Outstanding (in shares)       0      
Gross Proceeds       $ 697,000      
Fees       84,000      
Net Proceeds       $ 613,000      
Price As Adjusted, Conversions (in dollars per share)       $ 180      
Series AAA-3 Junior Preferred Stock [Member] | Warrants Issued With Placement Agent Agreement [Member]              
Placement Agent Warrants (in shares) [1]       0      
Series AAA-3 Junior Preferred Stock [Member] | Preferred Stock Converted to Preferred Stock [Member]              
Shares Purchased/ Issued in Exchange (in shares) [2]       697      
Conversions / Exchanges (in shares)       (697)      
Converted to Common stock (in shares)       697      
Series AAA-3 Junior Preferred Stock [Member] | Preferred Stock Converted to Common Stock [Member]              
Conversions / Exchanges (in shares)       0      
Original (in shares)       4,000      
Conversion of preferred stock to common stock (in shares) [3]       (4,000)      
Converted to Common stock (in shares)       0      
Series AAA-4 Junior Preferred Stock [Member]              
Conversion Prices (in dollars per share) [4],[5],[6],[7]       $ 600      
Preferred Stock, Shares Outstanding (in shares)       0      
Gross Proceeds       $ 399,000      
Fees       48,000      
Net Proceeds       $ 351,000      
Price As Adjusted, Conversions (in dollars per share)       $ 180      
Series AAA-4 Junior Preferred Stock [Member] | Warrants Issued With Placement Agent Agreement [Member]              
Placement Agent Warrants (in shares) [1]       0      
Series AAA-4 Junior Preferred Stock [Member] | Preferred Stock Converted to Preferred Stock [Member]              
Shares Purchased/ Issued in Exchange (in shares) [2]       399      
Conversions / Exchanges (in shares)       (399)      
Converted to Common stock (in shares)       399      
Series AAA-4 Junior Preferred Stock [Member] | Preferred Stock Converted to Common Stock [Member]              
Conversions / Exchanges (in shares)       0      
Original (in shares)       2,000      
Conversion of preferred stock to common stock (in shares) [3]       (2,000)      
Converted to Common stock (in shares)       0      
Series AAAA Junior Convertible Preferred Stock [Member]              
Conversion Prices (in dollars per share) [4],[5],[6],[7],[8]       $ 58.92      
Shares Purchased/ Issued in Exchange (in shares)   3,775,047          
Preferred Stock, Shares Outstanding (in shares) [8]       97,413      
Gross Proceeds [8]       $ 0      
Fees [8]       0      
Net Proceeds [8]       $ 0      
Series AAAA Junior Convertible Preferred Stock [Member] | Warrants Issued With Placement Agent Agreement [Member]              
Placement Agent Warrants (in shares) [1],[8]       0      
Series AAAA Junior Convertible Preferred Stock [Member] | Preferred Stock Converted to Preferred Stock [Member]              
Shares Purchased/ Issued in Exchange (in shares) [2],[8]       3,394,964      
Conversions / Exchanges (in shares) [8]       (3,297,551)      
Converted to Common stock (in shares) [8]       3,297,551      
Series AAAA Junior Convertible Preferred Stock [Member] | Preferred Stock Converted to Common Stock [Member]              
Conversions / Exchanges (in shares) [8]       (2,000)      
Original (in shares) [8]       58,000      
Conversion of preferred stock to common stock (in shares) [3],[8]       (56,000)      
Converted to Common stock (in shares) [8]       2,000      
Series B Preferred Stock [Member]              
Conversion Prices (in dollars per share) [4],[5],[6],[7],[9]       $ 84      
Preferred Stock, Shares Outstanding (in shares) [9]       0      
Gross Proceeds [9]       $ 0      
Fees [9]       0      
Net Proceeds [9]       $ 0      
Series B Preferred Stock [Member] | Warrants Issued With Placement Agent Agreement [Member]              
Placement Agent Warrants (in shares) [1],[9]       0      
Series B Preferred Stock [Member] | Preferred Stock Converted to Preferred Stock [Member]              
Shares Purchased/ Issued in Exchange (in shares) [2],[9]       16,321      
Conversions / Exchanges (in shares) [9]       (16,321)      
Converted to Common stock (in shares) [9]       16,321      
Series B Preferred Stock [Member] | Preferred Stock Converted to Common Stock [Member]              
Conversions / Exchanges (in shares) [9]       0      
Original (in shares) [9]       194,000      
Conversion of preferred stock to common stock (in shares) [3],[9]       (194,000)      
Converted to Common stock (in shares) [9]       0      
Series C Preferred Stock [Member]              
Conversion Prices (in dollars per share) [4],[5],[6],[7],[10]       $ 12      
Preferred Stock, Shares Outstanding (in shares) [10]       1,153      
Fees [10]       $ 0      
Series C Preferred Stock [Member] | Preferred Stock Converted to Preferred Stock [Member]              
Shares Purchased/ Issued in Exchange (in shares) [2],[10]       1,153      
Conversions / Exchanges (in shares) [10]       0      
Converted to Common stock (in shares) [10]       (0)      
Series C Preferred Stock [Member] | Preferred Stock Converted to Common Stock [Member]              
Conversions / Exchanges (in shares) [10]       (96,000)      
Original (in shares) [10]       96,000      
Conversion of preferred stock to common stock (in shares) [3],[10]       0      
Converted to Common stock (in shares) [10]       96,000      
[1] Pursuant to the terms of the Placement Agent Agreements, the Company agreed to issue to the Placement Agent, following the final closing under the individual Preferred Stock Offerings (effective as of the respective individual series closing dates), five-year warrants to purchase 14.5% of the shares of common stock issuable upon conversion of the respective series of Convertible Preferred Stock sold in the respective Preferred Stock Offering, at an exercise price equal to the applicable Preferred Stock Offering conversion price. See below for placement agent warrants exchanged in connection with the Exchange.
[2] Series AAA and Series AAA-2 totals include 4,011 and 2,356 preferred shares, respectively, issued in connection with the Series Exchange Agreements described below.
[3] As adjusted to reflect reduction in conversion prices as a result of the Series AA Down Round Feature, described below.
[4] In July 2025, the conversion prices for the AAA Preferred and the AAA Junior Preferred were adjusted pursuant to the applicable Down Round Feature. The conversion prices for AAA, AAA-2, AAA Junior, AAA Junior-2, AAA Junior-3 and AAA Junior-4 Preferred stock outstanding were adjusted to the conversion prices shown in the table above on the applicable date that the Down Round Feature was triggered (“July 2025 Down Round”). The July 2025 Down Round resulted in a deemed dividend totaling $308,000, which was charged to accumulated deficit in the December 31, 2025 balance sheet.
[5] The Conversion price for Series AA Preferred Stock outstanding as of August 23, 2023, totaling 10,706 shares of Series AA Preferred Stock, was adjusted to $1,248.00 as a result of the Series AA Down Round Feature described below.
[6] The Conversion prices for the Series AA Preferred Stock outstanding as of November 30, 2023, totaling 7,322 shares of Series AA Preferred Stock, were adjusted to the conversion prices shown in the table above, as a result of the Series AA Down Round Feature described below.
[7] The triggering of the Down Round Feature for the Series AA Preferred Stock, occurring in August 2023, resulted in a deemed dividend totaling $6,446,000, which was charged to retained earnings.
[8] Series AAAA Junior Preferred Stock was issued in exchange for certain outstanding debt, as described at Note 5.
[9] Series B Preferred Stock was issued in exchange for certain preferred stock outstanding, as described below.
[10] Series C Preferred Stock was issued in conjunction with the YP Note Exchange described at Note 6.