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Note 9 - Financing Activities (Details Textual)
 1 Months Ended 3 Months Ended 6 Months Ended
Jun. 30, 2024
USD ($)
$ / shares
shares
Mar. 24, 2024
USD ($)
shares
May 01, 2023
USD ($)
$ / shares
shares
Apr. 27, 2023
Jun. 30, 2024
USD ($)
$ / shares
shares
Dec. 31, 2023
USD ($)
$ / shares
shares
May 31, 2023
USD ($)
Jun. 30, 2024
USD ($)
$ / shares
shares
Mar. 31, 2024
$ / shares
shares
Jun. 30, 2023
USD ($)
$ / shares
Jun. 30, 2024
USD ($)
$ / shares
shares
Jun. 30, 2023
USD ($)
$ / shares
shares
Dec. 31, 2022
$ / shares
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares $ 37.4       $ 37.4 $ 50.96   $ 37.4   $ 76.23 $ 37.4 $ 76.23 $ 269.54
Class of Warrant or Right, Exercised During Period (in shares) | shares                     90,381,000 (0)  
Proceeds from Warrant Exercises                     $ 226,000 $ 0  
Modification of Warrants                     69,000 285,000  
Fair Value Adjustment of Warrants               $ 80,000   $ (216,000) (114,000) $ (216,000)  
The 2023 Private Placement [Member]                          
Debt Issuance Costs, Net     $ 700,000                    
Other Expenses     400,000                    
Proceeds From Debenture and Warrant Issuances, Net     3,000,000                    
Proceeds from Issuance of Warrants     1,600,000                    
Proceeds from Derivative Instrument, Financing Activities             $ 200,000            
Proceeds from Convertible Debt     1,200,000                    
The 2024 Warrant Reprice Transaction [Member]                          
Debt Issuance Costs, Net $ 96,000       $ 96,000     96,000     96,000    
Unsecured Convertible Notes [Member]                          
Debt Issuance Costs, Net   $ 130,000                      
Debt Instrument, Face Amount   $ 525,000                      
Debt Instrument, Convertible, Number of Equity Instruments   107,146                      
Adjustments to Additional Paid in Capital, Stock Issued, Issuance Costs   $ 19,000                      
Other Expenses 15,000 $ 111,000           14,000          
Original Issue Discount Senior Secured Convertible Debentures [Member]                          
Debt Issuance Costs, Net 15,000   300,000   15,000     15,000     15,000    
Debt Instrument, Face Amount     3,300,000                    
Debt Instrument, Convertible, Number of Equity Instruments       72,528         16,376        
Fair Value Adjustment of Warrants     40,000                    
Debt Instrument, Unamortized Discount $ 92,000   300,000   $ 92,000     $ 92,000     $ 92,000    
Original Issue Discount Senior Secured Convertible Debentures [Member] | The 2023 Private Placement [Member]                          
Debt Instrument, Unamortized Discount     $ 300,000                    
The 2024 Warrant Reprice Existing Warrants [Member]                          
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares $ 2.5       $ 2.5     $ 2.5     $ 2.5    
Class of Warrant or Right, Exercised During Period (in shares) | shares         90,381                
Proceeds from Warrant Exercises         $ 200,000                
June 2024 Warrant [Member]                          
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares $ 2.57       $ 2.57     $ 2.57     $ 2.57    
Warrants and Rights Outstanding, Term 5 years 6 months       5 years 6 months     5 years 6 months     5 years 6 months    
Class of Warrant or Right, Number of Securities Called by Warrants or Rights | shares 90,381       90,381     90,381     90,381    
The 2024 Warrant Reprice Transaction [Member]                          
Modification of Warrants               $ (69)     $ (69)    
March 2024 Warrant [Member]                          
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares $ 4.9       $ 4.9     $ 4.9 $ 4.9   $ 4.9    
Class of Warrant or Right, Number of Securities Called by Warrants or Rights | shares   28,572             28,572        
May 2023 Warrants [Member]                          
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares 8.75       $ 8.75 $ 45.5   8.75     8.75    
Proceeds from Warrant Exercises           $ 200,000              
Class of Warrant or Right, Number of Securities Called by Warrants or Rights | shares           72,256              
Adjustments to Additional Paid in Capital, Stock Issued, Issuance Costs           $ 100,000              
Fair Value Adjustment of Warrants         $ (47,000) $ (170,000)              
The 2023 Warrant Reprice Transaction [Member]                          
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares           $ 8.75              
Proceeds from Warrant Exercises           $ 600,000              
Debt Issuance Costs, Net           $ 200,000              
Class of Warrant or Right, Number of Securities Called by Warrants or Rights | shares           72,256              
Other Expenses           $ 100,000              
The December 2023 Warrants [Member]                          
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares $ 8.75       $ 8.75 $ 8.75   $ 8.75     $ 8.75    
Proceeds from Warrant Exercises           $ 400,000              
Class of Warrant or Right, Number of Securities Called by Warrants or Rights | shares           72,256              
The 2023 Private Placement [Member]                          
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares     $ 52.5                    
Class of Warrant or Right, Number of Securities Called by Warrants or Rights | shares     145,056                    
Fair Value Adjustment of Warrants     $ 400,000