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Note 1 - Accounting Policies (Details Textual) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Bank Overdrafts | $ 3,509,000 | $ 467,000 |
Due from Employees, Current | 628,000 | 580,000 |
Increase in Depreciation Expense, As Result of Adjustments to Estimated Useful Lives and Salvage Values | 1,300,000 |  |
Increase (Decrease) in Net Income (Loss) as Result of Adjustments to Estimated Useful Lives and Salvage Values | $ (800,000) |  |
Increase (Decrease) in Net Income (Loss) Per Share as Result of Adjustments to Estimated Useful Lives and Salvage Values | $ (0.13) |  |
Period for Amortizing Prepaid Tires | 2 years |  |
Advertising Expense | $ 1,019,000 | $ 988,000 | $ 683,000
Reclassification from Current Deferred Income Tax Liability to Noncurrent Deferred Tax Liability [Member] | December 31, 2015 [Member] |  |  |
Prior Period Reclassification Adjustment | $ 1,800,000 |  |
Truckload Services [Member] | Sales Revenue, Services, Net [Member] | Product Concentration Risk [Member] |  |  |
Concentration Risk, Percentage | 88.40% | 87.60% | 92.50%

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