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Note 10 - Income Taxes (Details Textual) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Operating Loss Carryforwards, Total | $ 43,000 |
Deferred Tax Assets, Operating Loss Carryforwards, Total | 14,247 | $ 17,098
Deferred Tax Assets, Tax Credit Carryforwards, Other | 7,700 |
Deferred Tax Assets, Tax Credit Carryforwards, Alternative Minimum Tax | 1,100 |
Income Taxes Receivable | 9,600 | $ 9,000
Domestic Tax Authority [Member] |  |
Deferred Tax Assets, Operating Loss Carryforwards, Total | 9,000 |
State and Local Jurisdiction [Member] | California Franchise Tax Board [Member] |  |
Operating Loss Carryforwards, Total | 52,800 |
Deferred Tax Assets, Operating Loss Carryforwards, Total | $ 5,200 |

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