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Note 12 - Income Taxes (Details Textual) - USD ($)
$ in Thousands
 12 Months Ended
May 11, 2023
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent   21.00%    
Deferred Tax Liabilities, Difference in Cumulative Book Value of Depreciation of Property and Equipment   $ 117,700    
Liability for Uncertainty in Income Taxes, Current   100 $ 100 $ 400
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued   100 100 100
Unrecognized Tax Benefits that Would Impact Effective Tax Rate   0 100 400
Income Tax Expense (Benefit)   10,576 17,611 34,860
Domestic Tax Jurisdiction [Member]        
Operating Loss Carryforwards   46,400    
State and Local Jurisdiction [Member]        
Operating Loss Carryforwards   99,400    
Tax Credit Carryforward, Amount   600    
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 $ 200