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Note 9 - Financing Activities (Details Textual)
 1 Months Ended 3 Months Ended
Mar. 24, 2024
USD ($)
shares
Dec. 21, 2023
USD ($)
$ / shares
May 01, 2023
USD ($)
$ / shares
shares
Apr. 27, 2023
Dec. 31, 2023
USD ($)
$ / shares
shares
May 31, 2023
USD ($)
Mar. 31, 2024
USD ($)
$ / shares
shares
Mar. 31, 2023
USD ($)
$ / shares
Dec. 31, 2022
$ / shares
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares         $ 1.82   $ 1.6 $ 7.7 $ 7.7
Fair Value Adjustment of Warrants             $ (194,000) $ (0)  
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            
Unsecured Convertible Notes [Member]                  
Debt Instrument, Face Amount $ 525,000                
Debt Instrument, Convertible, Number of Equity Instruments 3,750,000                
Debt Issuance Costs, Net $ 130,000                
Adjustments to Additional Paid in Capital, Stock Issued, Issuance Costs 19,000                
Other Expenses $ 111,000                
Original Issue Discount Senior Secured Convertible Debentures [Member]                  
Debt Instrument, Face Amount     3,300,000            
Debt Instrument, Convertible, Number of Equity Instruments       2,538,464     1,030,944    
Debt Issuance Costs, Net     300,000       $ 48,000    
Fair Value Adjustment of Warrants     40,000            
Debt Instrument, Unamortized Discount     300,000       $ 293,000    
Original Issue Discount Senior Secured Convertible Debentures [Member] | The 2023 Private Placement [Member]                  
Debt Instrument, Unamortized Discount     $ 300,000            
Series D Warrants [Member]                  
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) | shares 1,000,000                
May 2023 Warrants [Member]                  
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) | shares         2,528,848        
Adjustments to Additional Paid in Capital, Stock Issued, Issuance Costs         $ 100,000        
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares         $ 1.3        
Proceeds from Warrant Exercises         $ 200,000        
Fair Value Adjustment of Warrants   $ 200,000              
The 2023 Warrant Reprice Transaction [Member]                  
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) | shares         2,528,848        
Debt Issuance Costs, Net         $ 200,000        
Other Expenses         $ 100,000        
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares   $ 0.25     $ 0.25        
Proceeds from Warrant Exercises         $ 600,000        
The December 2023 Warrants [Member]                  
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) | shares             2,528,848    
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares             $ 0.25    
Proceeds from Warrant Exercises         $ 400,000        
The 2023 Private Placement [Member]                  
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) | shares     5,076,928            
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares     $ 1.5            
Fair Value Adjustment of Warrants     $ 400,000