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Note 7 - Income Taxes (Details Textual) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | --- | ---
Deferred Tax Assets, Valuation Allowance | $ 25,696 | $ 18,823 | $ 13,867
Unrecognized Tax Benefits, Ending Balance | 236 | $ 175 | $ 118
Domestic Tax Authority [Member] | Internal Revenue Service (IRS) [Member] |  |  |
Operating Loss Carryforwards, Total | 52,000 |  |
Operating Loss Carryforwards, Subject To Expiration | 6,100 |  |
State and Local Jurisdiction [Member] |  |  |
Operating Loss Carryforwards, Total | $ 2,500 |  |

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