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Note 1 - Accounting Policies (Details Textual) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Bank Overdrafts | $ 4,377,000 | $ 3,509,000 |
Due from Employees, Current | 448,000 | 628,000 |
Increase in Depreciation Expense, As Result of Adjustments to Estimated Useful Lives and Salvage Values | $ 2,700,000 | 1,300,000 |
Period for Amortizing Prepaid Tires | 2 years |  |
Advertising Expense | $ 1,087,000 | $ 1,019,000 | $ 988,000
Truckload Services [Member] | Sales Revenue, Services, Net [Member] | Product Concentration Risk [Member] |  |  |
Concentration Risk, Percentage | 86.30% | 88.40% | 87.60%

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