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Note 6 - Income Taxes (Details Textual) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022 | Dec. 31, 2022
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent |  |  | 21.00% |  | 21.00%
Deferred Tax Liabilities, Net | $ 102,700 |  | $ 102,700 |  |
Income Tax Expense (Benefit) | 4,483 | $ 15,563 | $ 13,701 | $ 32,130 |
State and Local Jurisdiction [Member] | Tennessee Department of Revenue [Member] |  |  |  |  |
Income Tax Expense (Benefit) | $ (1,300) |  |  |  |

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