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Note 8 - Income Taxes (Details Textual) - USD ($) $ in Thousands | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Deferred Tax Assets, Valuation Allowance, Total | $ 41,281 | $ 39,516 |  |
Unrecognized Tax Benefits, Ending Balance | 2,482 | 2,482 | $ 2,482 | $ 2,482
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense, Total | 200 |  |  |
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued, Total | 1,100 | $ 1,000 |  |
Domestic Tax Authority [Member] |  |  |  |
Operating Loss Carryforwards, Total | 456,500 |  |  |
Unrecognized Tax Benefits that Would Impact Effective Tax Rate | 2,000 |  |  |
Domestic Tax Authority [Member] | General Business Tax Credit Carryforward [Member] |  |  |  |
Tax Credit Carryforward, Amount | 14,300 |  |  |
Domestic Tax Authority [Member] | Alternative Minimum Tax Credit Carryforward [Member] |  |  |  |
Tax Credit Carryforward, Amount | 5,500 |  |  |
State and Local Jurisdiction [Member] |  |  |  |
Operating Loss Carryforwards, Total | $ 1,077,500 |  |  |

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