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Note 10 - Income Taxes (Details Textual) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2021
Operating Loss Carryforwards, Total |  | $ 18,400
Deferred Tax Assets, Operating Loss Carryforwards, Total | $ 10,880 | 8,732
Deferred Tax Assets, Tax Credit Carryforwards, Other |  | 7,500
Deferred Tax Assets, Tax Credit Carryforwards, Alternative Minimum Tax |  | 1,000
Income Taxes Receivable | $ 19,500 | 41,100
Domestic Tax Authority [Member] |  |
Deferred Tax Assets, Operating Loss Carryforwards, Total |  | 3,870
Domestic Tax Authority [Member] | Internal Revenue Service (IRS) [Member] |  |
Open Tax Year | 2017 2018 2019 2020 2021 |
State and Local Jurisdiction [Member] | California Franchise Tax Board [Member] |  |
Operating Loss Carryforwards, Total |  | 45,900
Deferred Tax Assets, Operating Loss Carryforwards, Total |  | $ 4,500

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