Note 11 - Income Taxes (Details Textual) - USD ($) |
12 Months Ended | |
|---|---|---|
Dec. 31, 2025 |
Dec. 31, 2024 |
|
| Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount | $ 1,356,000 | $ (1,026,000) |
| Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense | 0 | $ 0 |
| Research Tax Credit Carryforward [Member] | ||
| Operating Loss Carryforwards | 107,065,000 | |
| Tax Credit Carryforward, Amount | 2,154,000 | |
| Domestic Tax Jurisdiction [Member] | ||
| Operating Loss Carryforwards, Ownership Change | 30,880,000 | |
| Operating Loss Carryforwards | 146,673,000 | |
| Operating Loss Carryforwards, Expiring | $ 75,138,000 | |