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Note 1 - Accounting Policies (Details Textual) |  | 12 Months Ended
--- | --- | ---
Mar. 08, 2022 $ / shares shares | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($)
Bank Overdrafts |  | $ 0 | $ 7,638,000 |
Due from Employees, Current |  | 43,000 | 136,000 |
Other Receivables, Net, Current, Total |  | 7,092,000 | 5,127,000 |
Impairment, Long-Lived Asset, Held-for-Use, Total |  | 0 | $ 0 |
Period for Amortizing Prepaid Tires (Month) |  |  | 24 months |
Advertising Expense |  | $ 1,154,000 | $ 1,102,000 | $ 1,269,000
Subsequent Event [Member] |  |  |  |
Treasury Stock, Shares, Retired (in shares) | shares | 12,268,395 |  |  |
Stockholders' Equity Note, Stock Split, Conversion Ratio | 2 |  |  |
Common Stock, Dividends, Per Share, Declared (in dollars per share) | $ / shares | $ 1 |  |  |
Truckload Services [Member] | Sales [Member] | Product Concentration Risk [Member] |  |  |  |
Concentration Risk, Percentage |  | 67.00% | 76.90% | 82.70%
Independent Contractors [Member] |  |  |  |
Other Receivables, Net, Current, Total |  | $ 1,037,000 | $ 614,000 |

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