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Note 1 - Description of Business and Basis of Presentation (Restated) (Details Textual) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2021 | Jun. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020
Defined Benefit Plan, Termination Charge | $ 0 |  | $ 0 | $ 6,945 | $ 0 |
Income Tax Expense (Benefit), Total | 1,780 |  | $ 2,140 | 3,690 | $ 7,090 |
Deferred Income Tax Assets, Net, Total | 352 |  |  | 352 |  | $ 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) |  |
Deferred Income Tax Assets, Net, Total | 352 |  |  | 352 |  |
Deferred Income Tax Liabilities, Net, Total | $ (1,448) |  |  | (1,448) |  |
Noncontributory Qualified Defined Pension Plans [Member] |  |  |  |  |  |
Defined Benefit Plan, Termination Charge |  | $ 6,900 |  | $ 6,900 |  |

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