Note 7 - Stockholders' Equity and Equity-linked Instruments (Details Textual)

v3.26.1

Note 7 - Stockholders' Equity and Equity-linked Instruments (Details Textual)													1 Months Ended				2 Months Ended	3 Months Ended								12 Months Ended
		Jan. 01, 2026	Oct. 22, 2025 USD ($) $ / shares shares	Oct. 20, 2025 USD ($) $ / shares shares	Jul. 11, 2025 $ / shares shares	Jul. 10, 2025 USD ($) $ / shares shares	Jun. 17, 2025	May 30, 2025 USD ($) $ / shares shares	May 29, 2025 USD ($) $ / shares shares	May 09, 2025 USD ($) $ / shares shares	Feb. 14, 2025 USD ($) shares	Oct. 24, 2024 USD ($) $ / shares	Jan. 31, 2025 shares	Sep. 30, 2024 USD ($) $ / shares shares	Jun. 30, 2024 USD ($) shares	Dec. 31, 2023 shares	Dec. 31, 2023 shares	Dec. 31, 2025 USD ($) $ / shares shares	Jun. 30, 2025 USD ($) shares	May 09, 2025 $ / shares shares	Dec. 31, 2024 USD ($) $ / shares shares	Sep. 30, 2024 USD ($) $ / shares shares		Jun. 30, 2024 USD ($) shares		Dec. 31, 2025 USD ($) $ / shares shares	Dec. 31, 2024 USD ($) $ / shares shares		Oct. 27, 2025 shares	Oct. 19, 2025 shares	Sep. 12, 2025 USD ($) $ / shares shares	Oct. 04, 2024 shares	Aug. 31, 2024 shares	Jun. 04, 2024	Nov. 30, 2023 shares	Aug. 23, 2023 $ / shares shares	May 29, 2023 shares
Preferred Stock, Shares Authorized (in shares)																		10,000,000			10,000,000					10,000,000	10,000,000										5,000,000
Preferred Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares			$ 0.001															$ 0.001			$ 0.001					$ 0.001	$ 0.001				$ 0.001
Total Capital, Shares Authorized																		110,000,000								110,000,000
Common Stock, Shares Authorized (in shares)				750,000,000				400,000,000										750,000,000			750,000,000					750,000,000	750,000,000			400,000,000							100,000,000
Common Stock, Capital Shares Reserved for Future Issuance																		3,517,835								3,517,835
Percentage of Voters For Quorum at Business Meeting																																		33.33%
Stock Issued During Period, Shares, New Issues													547														547
Proceeds from Issuance or Sale of Equity | $			$ 20,000,000
Debt, Current | $																		$ 1,500,000								$ 1,500,000
Common Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares			$ 0.001															$ 0.001			$ 0.001					$ 0.001	$ 0.001
Call Trigger Price | $ / shares			$ 36
Placement Agent Fee, Percentage			2.00%					8.00%
Private Placement, Conditional Amount | $			$ 5,000,000
Preferred Stock, Stated Value | $			$ 1,000															$ 1,000								$ 1,000
Preferred Stock, Shares Outstanding (in shares)																		98,636			17,499					98,636	17,499
Difference From Fair Value of New Preferred Stock and Carrying Value of Original Preferred Stock | $				$ 6,296,000																						$ 7,685,000
Warrants and Rights Outstanding | $																		$ 8,000			$ 935,000					$ 8,000	$ 935,000
Dividend Shares (in shares)																										8,071	356,356
Common Stock Dividends, Shares															1,923
Fair Value Shares Issued | $															$ 729,000											$ 291,000	$ 4,386,000	[1]
Measurement Input, Price Volatility [Member]
Warrants and Rights Outstanding, Measurement Input																					1.01						1.01
Conversion of Series A and AA to Series AAA [Member]
Conversion of Stock, Shares Converted																	6,367
Converted to Common stock (in shares)																	6,367
Series AAAA Junior Convertible Preferred Stock [Member]
Preferred Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares					$ 1
Stock Issued During Period, Shares, New Issues					3,775,047
Preferred Stock Dividends, Percentage of Common Shares					6000.00%
Preferred Stock, Percentage Consent Needed to Convert					1.00%
Preferred Stock, Convertible, Conversion Price, At Issuance | $ / shares	[2],[3],[4],[5],[6]																	$ 58.92								$ 58.92
Preferred Stock, Shares Outstanding (in shares)	[3]																	97,413								97,413
Series B Preferred Stock [Member]
Preferred Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares																															$ 0.001
Shares Designated																															16,426
Preferred Stock, Stated Value | $																															$ 1,000
Preferred Stock, Convertible, Conversion Price | $ / shares																															$ 84
Preferred Stock, Convertible, Conversion Price, At Issuance | $ / shares	[2],[4],[5],[6],[7]																	$ 84								$ 84
Preferred Stock, Shares Outstanding (in shares)	[7]																	0								0
Series C Preferred Stock [Member]
Preferred Stock, Convertible, Conversion Price, At Issuance | $ / shares	[2],[4],[5],[6],[8]																	$ 12								$ 12
Preferred Stock, Shares Outstanding (in shares)	[8]																	1,153								1,153
Series C Preferred Stock [Member] | YP Exchange Agreement [Member]
Shares Designated			4,700
Preferred Stock, Convertible, Conversion Price, At Issuance | $ / shares			$ 12
Series AAA Junior Preferred Stock [Member]
Shares Issued, Price Per Share | $ / shares																		$ 1,000			$ 1,000					$ 1,000	$ 1,000
Preferred Stock, Convertible, Conversion Price, At Issuance | $ / shares	[2],[4],[5],[6]																	$ 600								$ 600
Preferred Stock, Shares Outstanding (in shares)																		0								0
Series AAAA Junior and Series C Preferred Stock [Member]
Preferred Stock, Stated Value | $																		$ 1								$ 1
Series A A Preferred Stock [Member]
Preferred Stock, Convertible, Conversion Price | $ / shares																																				$ 1,248
Preferred Stock, Convertible, Conversion Price, At Issuance | $ / shares	[2],[4],[5],[6]																	$ 4,526.4								$ 4,526.4
Preferred Stock, Shares Outstanding (in shares)																		50								50									7,322	10,706
Deemed Dividend on Preferred Stock | $																										$ 6,446,000
Dividend Shares (in shares)																			530			13,239		39,690
Fair Value Shares Issued | $																			$ 89,000			$ 216,000	[1]	$ 661,000	[1]
Preferred Stock, Extension Period of Exercise																										6 months
Series AAA Convertible Preferred Stock [Member]
Preferred Stock, Convertible, Conversion Price, At Issuance | $ / shares	[2],[4],[5],[6]																	$ 801.6								$ 801.6
Preferred Stock, Shares Outstanding (in shares)																		0								0
Dividend Shares (in shares)																					61,880	36,003
Fair Value Shares Issued | $	[1]																				$ 415,000	$ 587,000
Series AAA-2 Convertible Preferred Stock [Member]
Preferred Stock, Convertible, Conversion Price, At Issuance | $ / shares	[2],[4],[5],[6]																	$ 820.8								$ 820.8
Preferred Stock, Shares Outstanding (in shares)																		20								20
Dividend Shares (in shares)																					29,708	40,858
Fair Value Shares Issued | $	[1]																				$ 195,000	$ 666,000
Series AAA and AAA-2 Convertible Preferred Stock [Member]
Dividend Shares (in shares)																		7,407								7,407
Stock Accrued During Period, Value, Stock Dividend | $																										$ 190,000
Fair Value Shares Issued | $																		$ 190,000
Series AAA AIRs [Member]
Preferred Stock, Extension Period of Exercise																										3 months
Preferred Stock, Expiration Period																										21 months
Aegis Capital Corporation [Member]
Placement Agent Fee, Percentage			9.00%
Placement Agent Fee, Amount | $			$ 125,000
Class of Warrants and Rights, Number of Securities Called by Warrants or Rights, Percentage of Total Common Stock Issuable Upon Conversion of Preferred Shares			5.00%
Minimum [Member] | Measurement Input, Risk Free Interest Rate [Member]
Warrants and Rights Outstanding, Measurement Input			0.0345															0.0347			0.0427					0.0347	0.0427
Minimum [Member] | Measurement Input, Expected Term [Member]
Warrants and Rights Outstanding, Measurement Input			2															1.7			2.71					1.7	2.71
Minimum [Member] | Measurement Input, Price Volatility [Member]
Warrants and Rights Outstanding, Measurement Input			0.93															1.53								1.53
Minimum [Member] | Series C Preferred Stock [Member]
Ownership Percentage			4.99%
Maximum [Member] | Measurement Input, Risk Free Interest Rate [Member]
Warrants and Rights Outstanding, Measurement Input			0.035															0.0364			0.0438					0.0364	0.0438
Maximum [Member] | Measurement Input, Expected Term [Member]
Warrants and Rights Outstanding, Measurement Input			3															3.73			4.74					3.73	4.74
Maximum [Member] | Measurement Input, Price Volatility [Member]
Warrants and Rights Outstanding, Measurement Input			1															1.60								1.60
Maximum [Member] | Series C Preferred Stock [Member]
Ownership Percentage			9.99%
Pipe Pre-Funded Warrants [Member]
Class of Warrants or Rights, Issued			1,334,584
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares			$ 0.00001
Proceeds from Issuance or Sale of Equity | $			$ 9,415,000
Class of Warrant or Right, Number of Securities Called by Warrants or Rights																		1,187,500								1,187,500			766,667
Warrant Floor Price | $ / shares			$ 6.84
Warrants and Rights Outstanding, Term			5 years
Pipe Pre-Funded Warrants [Member] | Minimum [Member]
Ownership Percentage			4.99%
Pipe Pre-Funded Warrants [Member] | Maximum [Member]
Ownership Percentage			9.99%
PIPE Warrant Shares [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares			$ 144
Pre-Funded Warrant [Member]
Shares Issued, Price Per Share | $ / shares								$ 57.48
Class of Warrant or Right, Issued During Period						14,419		4,987
Class of Warrant or Right, Issued During Period, Exercise Price | $ / shares								$ 0.00001
Class of Warrant or Right, Grant Date Fair Value | $ / shares						$ 0.001
Warrants Issued With Placement Agent Agreement [Member]
Class of Warrants and Rights, Number of Securities Called by Warrants or Rights, Percentage of Total Common Stock Issuable Upon Conversion of Preferred Shares																		14.50%								14.50%
Warrants and Rights Outstanding, Term																		5 years								5 years
Warrants and Rights Outstanding | $																		$ 6,000			$ 587,000					$ 6,000	$ 587,000
Placement Agent Warrants With Series A-2 Preferred Stock [Member]
Shares Issued, Price Per Share | $ / shares																					$ 820.8						$ 820.8
Class of Warrant or Right, Number of Securities Called by Warrants or Rights																		185								185
Placement Agent Warrants With Series A-2 Preferred Stock [Member] | Minimum [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares																		$ 3,648								$ 3,648
Placement Agent Warrants With Series A-2 Preferred Stock [Member] | Maximum [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares																		$ 6,436.8								$ 6,436.8
New Placement Agent Warrants, Exercise Price of 66.96 [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights																		724								724
New Placement Agent Warrants [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares																		$ 803.52								$ 803.52
New Placement Agent Warrants, Exercise Price of 68.40 [Member]
Stock Issued During Period, Shares, Warrant Exchange (in shares)																										417
Series B Warrants [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares				$ 12
Class of Warrant or Right, Number of Securities Called by Warrants or Rights				194,422
Warrants and Rights Outstanding | $				$ 945,000
Series B Warrants Issued to the Placement Agent [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights				29,167
Series AA Additional Investment Right [Member] | Measurement Input, Share Price [Member]
Warrants and Rights Outstanding, Measurement Input																		412.8								412.8
Series AA Additional Investment Right [Member] | Minimum [Member] | Measurement Input, Conversion Price [Member]
Warrants and Rights Outstanding, Measurement Input																		905.28								905.28
Series AA Additional Investment Right [Member] | Minimum [Member] | Measurement Input, Risk Free Interest Rate [Member]
Warrants and Rights Outstanding, Measurement Input																		0.0513								0.0513
Series AA Additional Investment Right [Member] | Minimum [Member] | Measurement Input, Expected Term [Member]
Warrants and Rights Outstanding, Measurement Input																		0.42								0.42
Series AA Additional Investment Right [Member] | Minimum [Member] | Measurement Input, Price Volatility [Member]
Warrants and Rights Outstanding, Measurement Input																		0.79								0.79
Series AA Additional Investment Right [Member] | Maximum [Member] | Measurement Input, Conversion Price [Member]
Warrants and Rights Outstanding, Measurement Input																		6,360								6,360
Series AA Additional Investment Right [Member] | Maximum [Member] | Measurement Input, Risk Free Interest Rate [Member]
Warrants and Rights Outstanding, Measurement Input																		0.0536								0.0536
Series AA Additional Investment Right [Member] | Maximum [Member] | Measurement Input, Expected Term [Member]
Warrants and Rights Outstanding, Measurement Input																		0.92								0.92
Series AA Additional Investment Right [Member] | Maximum [Member] | Measurement Input, Price Volatility [Member]
Warrants and Rights Outstanding, Measurement Input																		0.91								0.91
Series AA Preferred Additional Investment Rights [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights																		6,699								6,699							1,340
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Period Increase (Decrease) | $															$ 294,000
Pipe Purchase Agreement [Member]
Stock Issued During Period, Shares, New Issues			332,084
Shares Issued, Price Per Share | $ / shares			$ 12
Proceeds from Issuance or Sale of Equity | $			$ 20,000,000
Pipe Purchase Agreement [Member] | Minimum [Member]
Shares Issued, Price Per Share | $ / shares			$ 22.2
Pipe Purchase Agreement [Member] | Maximum [Member]
Shares Issued, Price Per Share | $ / shares			$ 31.2
May III Purchase Agreement [Member]
Stock Issued During Period, Shares, New Issues								6,646
Shares Issued, Price Per Share | $ / shares								$ 57.6
Proceeds from Issuance or Sale of Equity | $								$ 670,000
May II Underwriting Agreement [Member]
Stock Issued During Period, Shares, New Issues									869
Shares Issued, Price Per Share | $ / shares									$ 57.6
Equity Offering, Maximum Shares to be Issued									8,681
Proceeds from Issuance of Common Stock | $									$ 380,000
May II Over Allotment Option [Member]
Stock Issuable During Period									869
Underwriting Agreement [Member]
Shares Issued, Price Per Share | $ / shares										$ 81.6										$ 81.6
Common Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares										$ 0.001										$ 0.001
Equity Offering, Maximum Shares to be Issued										10,662										10,662
Proceeds from Issuance of Common Stock | $										$ 700,400
Over-Allotment Option [Member]
Shares Issued, Price Per Share | $ / shares										$ 81.6										$ 81.6
Stock Issuable During Period										1,287										1,600
Proceeds from Issuance of Common Stock | $										$ 104,999
Option, Period										45 days
Registered Direct Offering [Member]
Shares Issued, Price Per Share | $ / shares												$ 422.4
Common Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares												$ 0.001
Proceeds from Issuance of Common Stock | $												$ 1,000,000
Common Stock, Maximum Shares Sold (in shares)																																2,368
Equity Purchase Agreement [Member]
Stock Issued During Period, Shares, New Issues											625															1,494
Shares Issued, Price Per Share | $ / shares																		$ 163.2								$ 163.2
Proceeds from Issuance of Common Stock | $																										$ 231,000
Equity Offering, Maximum Amount | $						$ 20,000,000					$ 2,900,000
Equity Offering, Price Per Share, Percentage of Closing Price						92.00%					92.00%
Stock Issued During Period, Value, New Issues | $						$ 600,000					$ 159,000
Subscription Agreements [Member] | Series A Preferred Offerings [Member]
Preferred Stock Dividends, Percentage of Common Shares																		20.00%								20.00%
Preferred Stock Dividends, Period One																										12 months
Preferred Stock Dividends, Period Two																										24 months
Preferred Stock Dividends, Period Three																										90 days
Preferred Stock, Maximum Loans | $																		$ 5,000,000								$ 5,000,000
Preferred Stock Voting Exceptions, Minimum Amount of Indebtedness Required | $																		$ 5,000,000								$ 5,000,000
Subscription Agreements [Member] | Series AAA Junior Preferred Stock [Member]
Preferred Stock Dividends, Percentage of Common Shares																		20.00%								20.00%
Preferred Stock Dividends, Period One																										30 days
Preferred Stock Dividends, Period Two																										60 days
Series AAA Convertible Preferred Stock [Member] | Subscription Agreements [Member]
Preferred Stock, Down Round Feature, Period After Filing Date																										24 months
Series A & AA Exchange Agreements [Member] | Series AAA Convertible Preferred Stock [Member]
Stock Issued During Period, Shares, New Issues																4,011
Series A & AA Exchange Agreements [Member] | Series AAA-2 Convertible Preferred Stock [Member]
Stock Issued During Period, Shares, New Issues																										2,356
2025 Exchange Agreement [Member]
Shares Designated																															16,426
Series AAA-3 & AAA-4 Junior Subscription Agreements [Member]
Stock Issued During Period, Shares, New Issues														1,096
Proceeds from Issuance or Sale of Equity | $														$ 1,096,000
Series AAA-3 & AAA-4 Junior Subscription Agreements [Member] | Series AAA-3 and AAA-4 Junior Preferred Stock Warrants [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares														$ 480								$ 480
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right														3								3
Class of Warrant or Right, Issued During Period, Purchase Price | $ / shares														$ 1,000
Reverse Stock Split [Member]
Stockholders' Equity Note, Stock Split, Conversion Ratio		12					40
[1] Fair valued based on the closing price of the Company’s common stock on the respective common stock dividend payment date. [2] 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. [3] Series AAAA Junior Preferred Stock was issued in exchange for certain outstanding debt, as described at Note 5. [4] 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. [5] 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. [6] 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. [7] Series B Preferred Stock was issued in exchange for certain preferred stock outstanding, as described below. [8] Series C Preferred Stock was issued in conjunction with the YP Note Exchange described at Note 6.