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Note 11 - Equity Method Investment - TEL's Summarized Financial Information (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Dec. 31, 2021
Total Assets $ 660,069   $ 651,662
Total Liabilities 301,187   301,963
Other Assets [Member]      
Investment in TEL 51,011   44,196
Equity Method Investment, Nonconsolidated Investee or Group of Investees [Member] | Transport Enterprise Leasing LLC [Member]      
Total Assets 369,908   346,218
Total Liabilities 274,980   264,948
Total Equity 94,928   81,270
Revenue 32,336 $ 22,903  
Cost of Sales 4,499 1,143  
Operating Expenses 12,345 13,905  
Operating Income 15,492 7,855  
Net Income 13,658 $ 6,003  
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 $ 34   $ 802