Quarterly report pursuant to Section 13 or 15(d)

Note 5 - Debt (Details Textual)

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Note 5 - Debt (Details Textual) - USD ($)
3 Months Ended 6 Months Ended
Dec. 17, 2023
May 16, 2022
Jun. 30, 2024
Jun. 30, 2023
Mar. 31, 2023
Jun. 30, 2024
Jun. 30, 2023
Dec. 31, 2022
SLR Agreement [Member]                
Debt Instrument, Multiplication of Face Value of Account 85.00%              
Debt Instrument, Face Amount $ 4,000,000              
Debt Instrument, Term 24 months              
Debt Instrument, Finance Fee, Percentage 2.00%              
Debt Instrument, Service Fee Rate 0.30%              
Debt Instrument, Minimum Utilization $ 400,000              
Long-Term Debt, Gross     $ 672,000     $ 672,000    
Repayments of Debt           1,273,000    
Interest Expense, Debt     $ 14,000 $ 10,000   $ 33,000 $ 20,000  
SLR Agreement [Member] | Prime Rate [Member]                
Debt Instrument, Basis Spread on Variable Rate 2.00%              
SLR Agreement [Member] | Facility Rate [Member]                
Debt Instrument, Basis Spread on Variable Rate 6.00%              
Securities Purchase Agreement [Member] | Note Holders [Member]                
Debt Instrument, Face Amount   $ 4,320,000            
Debt Instrument, Term   12 months            
Debt Instrument, Discount, Percent   8.00%            
Debt Instrument, Interest Rate, Stated Percentage   9.00%            
Debt Instrument, Convertible, Conversion Price   $ 80            
Debt Instrument, Convertible, Threshold Percentage of Stock Price Trigger   90.00%            
Debt Instrument, Unamortized Discount   $ 320,000           $ 40,000
Amortization of Debt Discount (Premium)       $ 0     $ 40,000  
Interest Paid, Including Capitalized Interest, Operating and Investing Activities         $ 180,000      
Convertible Notes Payable         $ 0     539,000
Interest Payable               $ 180,000