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Note 12 - Income Taxes (Details Textual) - USD ($) $ in Thousands |  | 12 Months Ended
--- | --- | ---
May 11, 2023 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent |  | 21.00% | 21.00% | 21.00%
Deferred Tax Liabilities, Difference in Cumulative Book Value of Depreciation of Property and Equipment |  | $ 116,100 |  |
Liability for Uncertainty in Income Taxes, Current |  | 100 | $ 400 |
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued, Total |  | 100 | 100 |
Unrecognized Tax Benefits that Would Impact Effective Tax Rate |  | 100 | 400 | $ 600
Income Tax Expense (Benefit) |  | $ 17,611 | 34,860 | 20,962
Open Tax Year |  | 2020 2021 2022 |  |
Domestic Tax Authority [Member] |  |  |  |
Operating Loss Carryforwards |  | $ 50,000 |  |
Tax Credit Carryforward, Amount |  |  | 400 |
State and Local Jurisdiction [Member] |  |  |  |
Operating Loss Carryforwards |  | 80,600 |  |
Tax Credit Carryforward, Amount |  | 400 |  |
State and Local Jurisdiction [Member] | Tennessee Department of Revenue [Member] |  |  |  |
Income Tax Expense (Benefit) | $ 1,200 |  |  |
Transport Financial Services [Member] |  |  |  |
Discontinued Operation, Tax Effect of Discontinued Operation |  | $ 200 | $ 200 | $ 800

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