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Note 1 - Significant Accounting Policies (Details Textual)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
USD ($)
Mar. 31, 2018
USD ($)
Sep. 30, 2017
USD ($)
Sep. 30, 2018
USD ($)
Sep. 30, 2017
USD ($)
Number of Reportable Segments       2  
Number of Asset-based Operating Fleets Aggregated in a Segment       4  
Revenue from Contract with Customer, Including Assessed Tax $ 243,303   $ 178,631 $ 613,187 $ 501,701
Tractors [Member]          
Property, Plant and Equipment, Useful Life       5 years  
Property, Plant and Equipment, Salvage Value, Percentage 15.00%     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%     25.00%  
Managed Freight [Member]          
Revenue from Contract with Customer, Including Assessed Tax $ 46,250   $ 25,565 $ 90,875 $ 55,379
Managed Freight [Member] | Accounts Receivable Factoring Business [Member]          
Revenue from Contract with Customer, Including Assessed Tax       3,400  
Managed Freight [Member] | Warehousing Business [Member]          
Revenue from Contract with Customer, Including Assessed Tax       $ 11,700  
Accounting Standards Update 2014-09 [Member]          
Cumulative Effect on Retained Earnings, Net of Tax, Total   $ 600