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Note 10 - Income Taxes (Details Textual) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019
Operating Loss Carryforwards, Total | $ 28,600 |
Deferred Tax Assets, Operating Loss Carryforwards, Total | 10,880 | $ 14,247
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 | $ 9,600
Domestic Tax Authority [Member] |  |
Deferred Tax Assets, Operating Loss Carryforwards, Total | $ 6,000 |
Domestic Tax Authority [Member] | Internal Revenue Service (IRS) [Member] |  |
Open Tax Year | 2017 2018 2019 2020 |
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 |
Open Tax Year | 2016 2017 2018 2019 2020 |

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