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Note 9 - Commitments and Contingencies (Details Textual) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Dec. 31, 2023
Sep. 09, 2022
May 12, 2022
Loss Contingencies [Line Items]              
Operating Lease, Right-of-Use Asset $ 113,000   $ 113,000   $ 198,000    
Operating Lease, Liability, Current 122,000   122,000   121,000    
Imputed interest 6,000   6,000        
Cost Reduction Plan [Member]              
Loss Contingencies [Line Items]              
Reduction In Work Force           20.00%  
Restructuring Costs $ 0 $ 0 0 $ 0      
Total expenses     $ 400,000        
2023 RIF [Member]              
Loss Contingencies [Line Items]              
Reduction In Work Force 25.00%   25.00%        
Restructuring Costs $ 0 0 $ 0 0      
Total expenses     $ 200,000        
Insurance Financing Arrangement [Member]              
Loss Contingencies [Line Items]              
Line of Credit Facility, Interest Rate During Period     8.42%        
Line of Credit Facility, Expiration Period     9 months        
Remaining balance under insurance financing arrangements 200,000   $ 200,000   $ 200,000    
Corporate Office [Member]              
Loss Contingencies [Line Items]              
Lessee, operating lease, term of contract (Month)             39 months
Lessee, operating lease, renewal term (Month)             36 months
Operating Lease, Right-of-Use Asset 113,000   113,000        
Operating Lease, Liability, Current $ 122,000   $ 122,000        
Lessee, Operating Lease, Discount Rate 10.75%   10.75%        
Lessee, Operating Lease, Remaining Lease Term 10 months 24 days   10 months 24 days        
Operating Lease, Expense $ 32,000 $ 32,000 $ 97,000 $ 97,000      
Imputed interest 6,000   6,000        
Total remaining future minimum lease payments $ 128,000   $ 128,000