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Note 1 - Significant Accounting Policies (Details Textual)
$ in Thousands
3 Months Ended
Mar. 31, 2018
USD ($)
Mar. 31, 2017
USD ($)
Number of Reportable Segments 2  
Number of Asset-based Operating Fleets Aggregated in a Segment 3  
Revenue from Contract with Customer, Including Assessed Tax $ 173,566 $ 158,744
Tractors [Member]    
Property, Plant and Equipment, Useful Life 5 years  
Property, Plant and Equipment, Salvage Value, Percentage 15.00%  
Refrigerated Trailers [Member]    
Property, Plant and Equipment, Useful Life 7 years  
Dry Van Trailers [Member]    
Property, Plant and Equipment, Useful Life 10 years  
Property, Plant and Equipment, Salvage Value, Percentage 25.00%  
Managed Freight [Member]    
Revenue from Contract with Customer, Including Assessed Tax $ 19,018 $ 13,119
Managed Freight [Member] | Accounts Receivable Factoring Business [Member]    
Revenue from Contract with Customer, Including Assessed Tax 900  
Accounting Standards Update 2014-09 [Member]    
Cumulative Effect on Retained Earnings, Net of Tax, Total $ 600