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Note 15 - Commitments and Contingencies (Details Textual) - USD ($)
Aug. 26, 2014
Dec. 31, 2016
Dec. 31, 2015
Letters of Credit Outstanding, Amount   $ 27,200,000 $ 31,400,000
Revenue Equipment [Member]      
Purchase Commitment, Remaining Minimum Amount Committed   86,500,000 $ 145,600,000
Pending Litigation [Member]      
Estimated Litigation Liability   $ 500,000  
Cargo Claim [Member]      
Litigation Settlement, Amount $ 5,900,000