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Note 11 - Acquisition - Purchase Price Allocation (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Jul. 31, 2017
Dec. 31, 2016
Goodwill $ 39,764  
Special Logistics Dedicated, LLC [Member]      
Consideration   $ 137,600  
Cash   700  
Accounts receivable   9,400  
Other current assets   1,400  
Property and equipment   14,900  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles   75,500  
Accounts payable   (3,900)  
Accrued Liabilities   (200)  
Goodwill   $ 39,800