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Note 1 - Description of Business and Basis of Presentation (Restated) (Details Textual) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2020
Defined Benefit Plan, Termination Charge | $ 6,945 | $ 0 | $ 6,945 | $ 0 |
Income Tax Expense (Benefit), Total | (840) | $ 3,700 | 1,910 | $ 4,950 |
Deferred Income Tax Assets, Net, Total | 447 |  | 447 |  | $ 0
Deferred Income Tax Liabilities, Net, Total | 0 |  | 0 |  | $ 450
Revision of Prior Period, Error Correction, Adjustment [Member] |  |  |  |  |
Income Tax Expense (Benefit), Total | (1,800) |  | (1,800) |  |
Deferred Income Tax Assets, Net, Total | 447 |  | 447 |  |
Deferred Income Tax Liabilities, Net, Total | (1,353) |  | (1,353) |  |
Noncontributory Qualified Defined Pension Plans [Member] |  |  |  |  |
Defined Benefit Plan, Termination Charge | $ 6,900 |  | $ 6,900 |  |

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