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Note 2 - Significant Accounting Policies (Details) - Goodwill (USD $)
In Thousands, unless otherwise specified
 12 Months Ended 12 Months Ended 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2013
Acquisition of MVI Group [Member]
Dec. 31, 2013
Larson Group [Member]
Dec. 31, 2013
Midwest Truck Sales [Member]
Jul. 29, 2013
Midwest Truck Sales [Member]
Dec. 31, 2013
TransAuthority, Inc. [Member]
Sep. 30, 2013
TransAuthority, Inc. [Member]
Dec. 31, 2013
Prairie International Trucks [Member]
Oct. 28, 2013
Prairie International Trucks [Member]
Goodwill [Line Items]                    
Balance January 1, 2013 $ 215,464 $ 198,257 $ 17,365     $ 5,624   $ 7,727   $ 2,832
Balance December 31, 2013 215,464 198,257       5,624   7,727   2,832
Goodwill, acquired during period     $ 25 $ 1,000 $ 5,624   $ 7,727   $ 2,831