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Note 10 - Acquisition (Details Textual) - USD ($)
$ in Thousands
Jul. 31, 2017
Jul. 20, 2017
Sep. 30, 2017
Dec. 31, 2016
Goodwill     $ 55,737
Special Logistics Dedicated, LLC [Member]        
Business Combination, Consideration Transferred   $ 136,000    
Business Combination, Consideration Transferred, Liabilities Incurred   $ 0    
Payments to Acquire Businesses, Gross $ 137,600      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles 60,200      
Goodwill 55,700      
Special Logistics Dedicated, LLC [Member] | General and Administrative Expense [Member]        
Business Combination, Acquisition Related Costs $ 3,000