Annual report pursuant to Section 13 and 15(d)

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

v3.24.1.u1
Note 7 - Stockholders' Equity and Equity-linked Instruments (Details Textual)
 1 Months Ended 2 Months Ended 3 Months Ended 12 Months Ended 24 Months Ended
Dec. 31, 2023
USD ($)
$ / shares
shares
Sep. 12, 2023
USD ($)
$ / shares
shares
Sep. 07, 2023
Aug. 23, 2023
USD ($)
$ / shares
shares
Aug. 21, 2023
$ / shares
shares
May 01, 2023
shares
Apr. 30, 2023
shares
Mar. 25, 2022
USD ($)
shares
Dec. 31, 2023
USD ($)
$ / shares
shares
Jan. 31, 2023
$ / shares
shares
Dec. 31, 2022
$ / shares
shares
Dec. 31, 2023
USD ($)
$ / shares
shares
Dec. 31, 2022
USD ($)
$ / shares
shares
Dec. 31, 2023
USD ($)
$ / shares
shares
Nov. 30, 2023
shares
Sep. 30, 2023
$ / shares
May 30, 2023
$ / shares
shares
May 29, 2023
shares
Sep. 03, 2021
USD ($)
Aug. 01, 2018
$ / shares
shares
Dec. 31, 2015
$ / shares
shares
Preferred Stock, Shares Authorized (in shares) 10,000,000               10,000,000   10,000,000 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   $ 0.001       $ 0.001 $ 0.001
Total Capital, Shares Authorized                                       110,000,000  
Common Stock, Shares Authorized (in shares) 400,000,000               400,000,000   400,000,000 400,000,000 400,000,000 400,000,000     400,000,000 100,000,000      
Common Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares $ 0.001               $ 0.001   $ 0.001 $ 0.001 $ 0.001 $ 0.001   $ 0.001 $ 0.001        
Common Stock, Voting Rights Entitled                           1              
Preferred Stock, Shares Outstanding (in shares) 23,656               23,656   10,323 23,656 10,323 23,656              
Deemed Dividend on Preferred Stock | $                       $ 7,567,000 $ (0)                
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross           63,900 305,000         388,000                  
Proceeds From Issuance of Common Stock, Net of Issuance Costs | $                       $ 1,885,000 320,000                
Fair Value Adjustment of Warrants | $                       $ (2,898,000) (0)                
Tumim [Member]                                          
Common Stock, Maximum Shares Sold               10,000,000                          
Placement Agent Warrants With Series A-2 Preferred Stock [Member]                                          
Shares Issued, Price Per Share (in dollars per share) | $ / shares $ 1.71               $ 1.71     $ 1.71   $ 1.71              
Class of Warrant or Right, Exchanged During Period                 88,403                        
Class of Warrant or Right, Issued During Period                 347,428                        
Class of Warrant or Right, Issued During Period, Exercise Price | $ / shares                 $ 1.674                        
Stock Issued During Period, Shares, Warrant Exchange                 199,778                        
Fair Value Adjustment of Warrants | $                 $ 681,000                        
Placement Agent Warrants With Series A-2 Preferred Stock [Member] | Minimum [Member]                                          
Class of Warrant or Right, Exchanged During Period, Exercise Price | $ / shares                 $ 7.6                        
Placement Agent Warrants With Series A-2 Preferred Stock [Member] | Maximum [Member]                                          
Class of Warrant or Right, Exchanged During Period, Exercise Price | $ / shares                 $ 13.41                        
Warrants Issued With Placement Agent Agreement [Member]                                          
Warrants and Rights Outstanding, Term 5 years               5 years     5 years   5 years              
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%     14.50%   14.50%              
Pre-Funded Warrant [Member]                                          
Shares Issued, Price Per Share (in dollars per share) | $ / shares       $ 2.58                                  
Class of Warrant or Right, Issued During Period         67,500                                
Class of Warrant or Right, Issued During Period, Exercise Price | $ / shares         $ 0.001                                
Series AA Into Series AAA Preferred Stock [Member]                                          
Conversion of Stock, Shares Converted                       6,367                  
Conversion of Stock, Shares Issued                       6,367                  
Subscription Agreements [Member] | Securities Purchase Agreement [Member]                                          
Percentage of Proceeds from Issuance of Equity to Redeem Debt Outstanding                     50.00%                    
Proceeds from Issuance of Preferred Stock Used in Connection With Redemption of Debt | $                       $ 719,000 $ 3,621,000                
Underwriting Agreement [Member]                                          
Stock Issued During Period, Shares, New Issues (in shares)         778,653                                
Shares Issued, Price Per Share (in dollars per share) | $ / shares       $ 2.6                                  
Proceeds, Issuance of Shares, Share-Based Payment Arrangement, Including Option Exercised | $   $ 84,800                                      
Proceeds From Issuance of Common Stock, Net of Issuance Costs | $       $ 1,800,000                                  
Underwriting Agreement [Member] | Minimum [Member]                                          
Beneficial Ownership, Minimum Percentage of Shares Outstanding, Initial         4.99%                                
Underwriting Agreement [Member] | Maximum [Member]                                          
Beneficial Ownership, Minimum Percentage of Shares Outstanding, Initial         9.99%                                
Over-Allotment Option [Member]                                          
Stock Issued During Period, Shares, New Issues (in shares)   32,616                                      
Shares Issued, Price Per Share (in dollars per share) | $ / shares   $ 2.6                                      
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross         126,923                                
Dividend Acceleration Agreements [Member]                                          
Stock Issued During Period, Shares, New Issues (in shares)                 114,452                        
Stock Issued During Period, Value, New Issues | $                 $ 174,000                        
Purchase Agreement [Member] | Tumim [Member]                                          
Stock Issued During Period, Shares, New Issues (in shares)               2,500         371                
Shares Issued, Price Per Share (in dollars per share) | $ / shares                     $ 22.2   $ 22.2                
Proceeds From Issuance of Common Stock, Net of Issuance Costs | $                         $ 8,000                
Stock Issued During Period, Value, New Issues | $               $ 100,000                          
Common Stock, Maximum Shares Allowed to Issue and Sell, Initial               368,091                          
Common Stock, Maximum Shares Allowed to Issue and Sell, Percentage of Shares Issued and Outstanding, Initial               19.99%                          
Common Stock, Price Per Share, Percentage of Weighted Average Price               95.00%                          
Purchase Agreement [Member] | Minimum [Member] | Tumim [Member]                                          
Beneficial Ownership, Minimum Percentage of Shares Outstanding, Initial               4.99%                          
Purchase Agreement [Member] | Maximum [Member] | Tumim [Member]                                          
Beneficial Ownership, Minimum Percentage of Shares Outstanding, Initial               9.99%                          
Sales Agreement [Member] | Agents [Member]                                          
Stock Issued During Period, Shares, New Issues (in shares)                         16,182                
Shares Issued, Price Per Share (in dollars per share) | $ / shares                     $ 19.8   $ 19.8                
Proceeds From Issuance of Common Stock, Net of Issuance Costs | $                         $ 312,000                
Common Stock, Maximum Amount to Be Distributed Through Financial Institutions | $                                     $ 75,000,000    
Financial Institutions, Commission Rate                                     3.00%    
Series AAA and AAA-2 Convertible Preferred Stock [Member]                                          
Preferred Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares $ 0.001               $ 0.001     $ 0.001   $ 0.001              
Stock Issued During Period, Shares, New Issues (in shares)                       8,355                  
Shares Issued, Price Per Share (in dollars per share) | $ / shares $ 1,000               $ 1,000     $ 1,000   $ 1,000              
Preferred Stock, Shares Outstanding (in shares) 8,355               8,355     8,355   8,355              
Original Conversion Shares (in shares) 4,954,000               4,954,000     4,954,000   4,954,000              
Series A Preferred Offerings [Member]                                          
Stock Issued During Period, Shares, New Issues (in shares)                       12,622                  
Preferred Stock, Shares Outstanding (in shares) 2,949               2,949     2,949   2,949              
Original Conversion Shares (in shares) 1,120,000               1,120,000     1,120,000   1,120,000              
Series A Preferred Offerings [Member] | Subscription Agreements [Member]                                          
Preferred Stock, Stated Value | $ / shares $ 1,000               $ 1,000     $ 1,000   $ 1,000              
Preferred Stock, Beneficial Ownership Limitations, Percentage of Outstanding Shares Required to be Converted When Common Stock Volume-weighted Average Price Over Previous 10 Days as Reported Equals More Than 250% of Conversion Price 50.00%               50.00%     50.00%   50.00%              
Preferred Stock, Beneficial Ownership Limitations, Percentage of Outstanding Shares Required to be Converted When Common Stock Volume-weighted Average Price Over Previous 10 Days as Reported Equals More Than 300% of Conversion Price 100.00%               100.00%     100.00%   100.00%              
Preferred Stock, Maximum Loans | $ $ 5,000,000               $ 5,000,000     $ 5,000,000   $ 5,000,000              
Preferred Stock Dividends, Percentage of Common Shares 20.00%               20.00%     20.00%   20.00%              
Preferred Stock, Beneficial Ownership Limitation, Minimum Percentage of Outstanding Preferred Stock Shares Required 51.00%               51.00%     51.00%   51.00%              
Preferred Stock Voting Exceptions, Minimum Amount of Indebtedness Required | $ $ 5,000,000               $ 5,000,000     $ 5,000,000   $ 5,000,000              
Minimum Offering Amount for Board of Directors Appointment | $ $ 10               $ 10     $ 10   $ 10              
Series A Preferred Offerings [Member] | Placement Agency Agreement [Member]                                          
Placement Fee, Percentage of Proceeds from Issuance of Equity 10.00%                                        
Nonaccountable Expense, Percentage of Proceeds from Issuance of Equity 3.00%                                        
Series AA, AA-2, AA-3, and AA-4 Convertible Preferred Stock [Member]                                          
Stock Issued During Period, Shares, New Issues (in shares)                       11,781                  
Conversion of Stock, Shares Converted [1]                       4,249,000                  
Preferred Stock, Shares Outstanding (in shares) 6,210               6,210     6,210   6,210              
Original Conversion Shares (in shares) 1,233,000               1,233,000     1,233,000   1,233,000              
Series AA, AA-2, AA-3, and AA-4 Convertible Preferred Stock [Member] | Subscription Agreements [Member]                                          
Preferred Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares $ 0.001               $ 0.001 $ 0.001   $ 0.001   $ 0.001              
Stock Issued During Period, Shares, New Issues (in shares)                   12,622   11,781                  
Shares Issued, Price Per Share (in dollars per share) | $ / shares 1,000               1,000 $ 1,000   $ 1,000   1,000              
Series A A Preferred Stock [Member]                                          
Stock Issued During Period, Shares, New Issues (in shares)                       7,680                  
Preferred Stock, Shares Outstanding (in shares)       10,706                     7,322            
Preferred Stock, Convertible, Conversion Price | $ / shares 9.43     $ 2.6         9.43     $ 9.43   9.43              
Deemed Dividend on Preferred Stock | $                       $ 7,567,000                  
Series A A Preferred Stock [Member] | Subscription Agreements [Member]                                          
Preferred Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares $ 1,000               $ 1,000     $ 1,000   $ 1,000              
Preferred Stock, Beneficial Ownership Limitations, Percentage of Outstanding Shares Required to be Converted When Common Stock Volume-weighted Average Price Over Previous 10 Days as Reported Equals More Than 250% of Conversion Price 50.00%               50.00%     50.00%   50.00%              
Preferred Stock, Beneficial Ownership Limitations, Percentage of Outstanding Shares Required to be Converted When Common Stock Volume-weighted Average Price Over Previous 10 Days as Reported Equals More Than 300% of Conversion Price 100.00%               100.00%     100.00%   100.00%              
Preferred Stock Dividends, Percentage of Common Shares 20.00%               20.00%     20.00%   20.00%              
Original Conversion Shares (in shares) 3,500,000               3,500,000     3,500,000   3,500,000              
Preferred Stock, Convertible, Conversion Percentage 125.00%               125.00%     125.00%   125.00%              
Series AA-2 Convertible Preferred Stock [Member]                                          
Stock Issued During Period, Shares, New Issues (in shares)                       1,500                  
Shares Issued, Price Per Share (in dollars per share) | $ / shares $ 1,000               $ 1,000     $ 1,000   $ 1,000              
Conversion of Stock, Shares Converted [1]                       130,000                  
Preferred Stock, Shares Outstanding (in shares) 0               0     0   0              
Preferred Stock, Convertible, Conversion Price | $ / shares       10.43                                  
Original Conversion Shares (in shares) 144,000               144,000     144,000   144,000              
Series AA-3 Convertible Preferred Stock [Member]                                          
Stock Issued During Period, Shares, New Issues (in shares)                       1,025                  
Shares Issued, Price Per Share (in dollars per share) | $ / shares $ 1,000               $ 1,000     $ 1,000   $ 1,000              
Conversion of Stock, Shares Converted [1]                       432,000                  
Preferred Stock, Shares Outstanding (in shares) 391               391     391   391              
Preferred Stock, Convertible, Conversion Price | $ / shares       9.5                                  
Original Conversion Shares (in shares) 108,000               108,000     108,000   108,000              
Series AA-4 Convertible Preferred Stock [Member]                                          
Stock Issued During Period, Shares, New Issues (in shares)                       1,026                  
Shares Issued, Price Per Share (in dollars per share) | $ / shares $ 1,000               $ 1,000     $ 1,000   $ 1,000              
Conversion of Stock, Shares Converted [1]                       443,000                  
Preferred Stock, Shares Outstanding (in shares) 515               515     515   515              
Preferred Stock, Convertible, Conversion Price | $ / shares       9.28                                  
Original Conversion Shares (in shares) 109,000               109,000     109,000   109,000              
Series AA-5 Convertible Preferred Stock [Member]                                          
Stock Issued During Period, Shares, New Issues (in shares)                       550                  
Shares Issued, Price Per Share (in dollars per share) | $ / shares $ 1,000               $ 1,000     $ 1,000   $ 1,000              
Conversion of Stock, Shares Converted [1]                       201,000                  
Preferred Stock, Shares Outstanding (in shares) 550               550     550   550              
Preferred Stock, Convertible, Conversion Price | $ / shares       $ 10.6                                  
Original Conversion Shares (in shares) 58,000               58,000     58,000   58,000              
Reverse Stock Split [Member]                                          
Stockholders' Equity Note, Stock Split, Conversion Ratio     20                                    
[1] 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. The original conversion prices for the Series AA Preferred, as of the respective issuance dates, were as follows: Series AA - $9.43; Series AA-2 - $10.43; Series AA-3 - $9.50; Series AA-4 - $9.28; Series AA-5 - $10.60.