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Note 11 - Equity Method Investment - TEL's Summarized Financial Information (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Dec. 31, 2022
Operating lease obligations $ 14,247   $ 14,247   $ 18,179
Total Assets 870,506   870,506   796,645
Total Liabilities 490,842   490,842   419,517
Transport Enterprise Leasing LLC [Member]          
Total Assets 599,243   599,243   480,724
Total Liabilities 473,747   473,747   377,548
Total Equity 125,496   125,496   103,177
Revenue 37,124 $ 33,857 77,269 $ 66,096  
Cost of Sales 3,325 5,645 10,330 10,118  
Operating Expenses 19,903 11,754 39,296 24,028  
Operating Income 13,896 16,458 27,643 31,950  
Net Income 10,873 $ 14,728 22,319 $ 28,386  
Transport Enterprise Leasing LLC [Member] | Driver Advances and Other Receivable [Member]          
Accounts receivable from TEL 86   86   9
Transport Enterprise Leasing LLC [Member] | Accrued Expenses [Member]          
Accounts payable to TEL 413   413   763
Transport Enterprise Leasing LLC [Member] | Other Assets [Member]          
Investment in TEL 66,051   66,051   54,727
Transport Enterprise Leasing LLC [Member] | Operating Lease Liability, Current [Member]          
Operating lease obligations $ 11,099   $ 11,099   $ 13,825