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Note 8 - Income Taxes (Details Textual) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Elimination of AMT Operating Loss Carryforwards |  |  | $ 91,300
Income Tax Expense (Benefit), Total |  | $ 4,999 | $ (5,000)
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent | 21.00% | 21.00% |
Operating Loss Carryforwards that Do Not Expire | $ 5,200 |  |
Domestic Tax Authority [Member] |  |  |
Operating Loss Carryforwards, Total | 71,700 |  |
State and Local Jurisdiction [Member] |  |  |
Operating Loss Carryforwards, Total | $ 85,700 |  |

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