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Note 1 - Accounting Policies (Details Textual) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Bank Overdrafts | $ 7,638,000 | $ 2,572,000 |
Due from Employees, Current | 136,000 | 211,000 |
Other Receivables, Net, Current, Total | 5,127,000 | 3,769,000 |
Impairment of Long-Lived Assets Held-for-use | $ 0 | 0 |
Period for Amortizing Prepaid Tires (Month) | 24 months |  |
Advertising Expense | $ 1,102,000 | $ 1,269,000 | $ 1,234,000
Truckload Services [Member] | Sales [Member] | Product Concentration Risk [Member] |  |  |
Concentration Risk, Percentage | 76.90% | 82.70% | 80.00%
Independent Contractors [Member] |  |  |
Other Receivables, Net, Current, Total | $ 614,000 | $ 1,381,000 |

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