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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 |  |  |

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