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Note 8 - Commitments and Contingencies (Details Textual) - USD ($)
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Sep. 09, 2022
May 12, 2022
Loss Contingencies [Line Items]        
Operating Lease, Right-of-Use Asset $ 84,000 $ 198,000    
Operating Lease, Liability, Current 90,000 121,000    
Restructuring costs 0 225,000    
Cost Reduction Plan [Member]        
Loss Contingencies [Line Items]        
Reduction in work force     20.00%  
Total expenses $ 400,000      
2023 RIF [Member]        
Loss Contingencies [Line Items]        
Reduction in work force 25.00%      
Restructuring costs $ 0 200,000    
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 $ 100,000 200,000    
Corpotate Office [Member]        
Loss Contingencies [Line Items]        
Lessee, operating lease, term of contract (Year)       39 months
Lessee, operating lease, renewal term (Month)       36 months
Operating Lease, Right-of-Use Asset 84,000      
Operating Lease, Liability, Current $ 90,000      
Lessee, Operating Lease, Discount Rate 10.75%      
Lessee, Operating Lease, Remaining Lease Term 8 months 12 days      
Operating Lease, Expense $ 130,000 $ 130,000    
Imputed interest 3,000      
Total remaining future minimum lease payments $ 93,000