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Note 12 - Income Taxes (Details Textual) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023
Income Tax Expense (Benefit) | $ 0 | $ 0
Deferred Tax Liabilities, Net, Total | 0 | 0
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount | 1,800 | 2,700
Unrecognized Tax Benefits that Would Impact Effective Tax Rate | 1,300 | $ 1,200
Domestic Tax Jurisdiction [Member] | Internal Revenue Service (IRS) [Member] |  |
Operating Loss Carryforwards | 119,400 |
Domestic Tax Jurisdiction [Member] | Internal Revenue Service (IRS) [Member] | Research Tax Credit Carryforward [Member] |  |
Tax Credit Carryforward, Amount | 4,100 |
State and Local Jurisdiction [Member] |  |
Operating Loss Carryforwards | 65,300 |
State and Local Jurisdiction [Member] | Research Tax Credit Carryforward [Member] |  |
Tax Credit Carryforward, Amount | $ 3,000 |

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