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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%