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Note 1 - Accounting Policies (Details Textual) - USD ($) | 1 Months Ended | 12 Months Ended
--- | --- | ---
Feb. 29, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Truckload Services [Member] | Sales Revenue, Services, Net [Member] | Product Concentration Risk [Member] |  |  |  |
Concentration Risk, Percentage |  | 87.60% | 92.50% | 92.60%
Subsequent Event [Member] | The 2016 Tender Offer [Member] | Minimum [Member] |  |  |  |
Treasury Stock Acquired Cost Per Share | $ 27 |  |  |
Subsequent Event [Member] | The 2016 Tender Offer [Member] | Maximum [Member] |  |  |  |
Treasury Stock Acquired Cost Per Share | $ 30 |  |  |
Subsequent Event [Member] | The 2016 Tender Offer [Member] |  |  |  |
Stock Repurchase Program, Number of Shares Authorized to be Repurchased | 325,000 |  |  |
Stock Repurchase Program Additional Shares Authroized To Be Repurchased Percent Of Outstanding Shares Percent | 2.00% |  |  |
Stock Repurchase Program Additional Shares Authorized To Be Repurchased Percent Of Outstanding Shares, Shares | 142,413 |  |  |
Bank Overdrafts |  | $ 467,000 | $ 0 |
Due from Employees, Current |  | $ 580,000 | 486,000 |
Decrease in Depreciation Expense as Result of Adjustments to Estimated Lives and Salvage Values |  |  |  | $ 550,000
Increase (Decrease) in Net Income (Loss) as Result of Adjustments to Estimated Lives and Salvage Values |  |  |  | 340,000
Increase (Decrease) in Net Income (Loss) Per Share as Result of Adjustments to Estimated Lives and Salvage Values |  |  |  | 0.04
Period for Amortizing Prepaid Tires |  | 2 years |  |
Advertising Expense |  | $ 988,000 | $ 683,000 | $ 662,000

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