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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