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Note 1 - Accounting Policies (Details Textual) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Other Receivables, Equipment Downtime Reimbursement | $ 2,100,000 | $ 994,000 |
Other Receivables, Net, Current | 7,203,000 | 6,263,000 |
Bank Overdrafts | 182,000 | 135,000 |
Advertising Expense | $ 2,014,000 | $ 2,101,000 | $ 1,154,000
Truckload Services [Member] | Sales [Member] | Product Concentration Risk [Member] |  |  |
Concentration Risk, Percentage | 65.30% | 66.00% | 67.00%
Independent Contractors [Member] |  |  |
Other Receivables, Net, Current | $ 768,000 | $ 1,379,000 |

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