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Note 11 - Equity Method Investment - TEL's Summarized Financial Information (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Total Assets $ 647,912   $ 676,716
Total Liabilities 351,255   386,074
Other Assets [Member]      
Investment in TEL 37,281   34,365
Equity Method Investment, Nonconsolidated Investee or Group of Investees [Member] | Transport Enterprise Leasing LLC [Member]      
Total Assets 322,254   374,591
Total Liabilities 255,059   318,743
Total Equity 67,195   55,848
Revenue 22,903 $ 25,221  
Cost of Sales 1,143 4,769  
Operating Expenses 13,905 18,875  
Operating Income 7,855 1,577  
Net Income (Loss) 6,003 $ (1,442)  
Equity Method Investment, Nonconsolidated Investee or Group of Investees [Member] | Transport Enterprise Leasing LLC [Member] | Driver Advances and Other Receivable [Member]      
Accounts receivable from TEL $ 1,023   $ 661