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Note 12 - Subsequent Event (Details Textual) - Subsequent Event [Member]
ft² in Millions, $ in Millions
Jul. 03, 2018
USD ($)
ft²
Landair [Member]  
Number of Tractors Operated 430
Number of Trailers Operated 900
Number of Distribution Facilities Managed 12
Landair [Member] | Warehouse Space [Member]  
Area of Real Estate Property | ft² 1.8
Acquisition of Landair [Member]  
Business Acquisition, Percentage of Voting Interests Acquired 100.00%
Payments to Acquire Businesses, Gross $ 83.0
Business Combination, Consideration Transferred, Liabilities Incurred 15.5
Business Combination, Consideration Transferred, Funded By Cash On Hand From Positive Operating Cash Flows 45.5
Business Combination, Consideration Transferred, Funded by Previously Unencumbered Used Revenue Equipment Financing 53.0
Business Acquisition, Revenue Reported by Acquired Entity for Last Annual Period 121.0
Acquisition of Landair [Member] | Dedicated Truckload Operations [Member]  
Business Acquisition, Revenue Reported by Acquired Entity for Last Annual Period 60.0
Acquisition of Landair [Member] | Managed Freight [Member]  
Business Acquisition, Revenue Reported by Acquired Entity for Last Annual Period 41.0
Acquisition of Landair [Member] | One-way Truckload Operations [Member]  
Business Acquisition, Revenue Reported by Acquired Entity for Last Annual Period $ 20.0