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Note 11 - Equity Method Investment - TEL's Summarized Financial Information (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Accounts Receivable, after Allowance for Credit Loss, Total | $ 91,300 | $ 81,200 | $ 97,500
Investment in TEL | 34,365 | 31,906 |
Current Assets | 147,796 | 254,385 |
Current Liabilities | 133,381 | 161,257 |
Other Assets [Member] |  |  |
Investment in TEL | 34,365 | 31,906 |
Equity Method Investment, Nonconsolidated Investee or Group of Investees [Member] | Transport Enterprise Leasing LLC [Member] |  |  |
Current Assets | 27,167 | 28,577 |
Non-current Assets | 283,913 | 346,014 |
Current Liabilities | 66,495 | 85,751 |
Non-current Liabilities | 183,393 | 232,992 |
Total Equity | 61,192 | 55,848 |
Revenue | 95,016 | 110,298 | 108,801
Cost of Sales | 11,617 | 20,404 | 37,307
Operating Expenses | 64,581 | 65,058 | 47,281
Operating Income | 18,818 | 24,836 | 24,213
Net Income | 8,344 | 13,403 | $ 16,496
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 | $ 661 | $ 1,251 |

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