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Note 11 - Equity Method Investment - TEL's Summarized Financial Information (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Accounts Receivable, after Allowance for Credit Loss, Total $ 142,400 $ 91,300
Investment in TEL 44,196 34,365
Current Assets 188,527 147,796
Current Liabilities 142,745 133,381
Other Assets [Member]    
Investment in TEL 44,196 34,365
Equity Method Investment, Nonconsolidated Investee or Group of Investees [Member] | Transport Enterprise Leasing LLC [Member]    
Current Assets 32,948 27,167
Non-current Assets 313,270 283,913
Current Liabilities 63,330 66,495
Non-current Liabilities 201,618 183,393
Total Equity 81,270 61,192
Revenue 104,873 95,016
Cost of Sales 8,876 11,617
Operating Expenses 58,627 64,581
Operating Income 37,370 18,818
Net Income 30,078 8,344
Equity Method Investment, Nonconsolidated Investee or Group of Investees [Member] | Transport Enterprise Leasing LLC [Member] | Driver Advances and Other Receivable [Member]    
Accounts Receivable, after Allowance for Credit Loss, Total $ 802 $ 661