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Note 4 - Goodwill (Details) - USD ($)
 9 Months Ended 12 Months Ended
Sep. 30, 2015
Dec. 31, 2014
Domestic [Member]    
Balance [1] $ 91,011,000 $ 22,548,000
Additions through acquisitions 5,825,000 68,463,000
Balance [1] 96,836,000 91,011,000
Reduction related to divestiture 0  
Import [Member]    
Balance [1] 79,601,000 16,797,000
Additions through acquisitions 3,870,000 62,804,000
Balance [1] 83,225,000 79,601,000
Reduction related to divestiture 246,000  
Luxury [Member]    
Balance [1] 28,763,000 10,166,000
Additions through acquisitions 1,803,000 18,597,000
Balance [1] 30,566,000 28,763,000
Reduction related to divestiture 0  
Balance [1] 199,375,000 49,511,000
Additions through acquisitions 11,498,000 149,864,000
Balance [1] 210,627,000 $ 199,375,000
Reduction related to divestiture $ 246,000  
[1] Net of accumulated impairment losses of $299.3 million recorded during the year ended December 31, 2008.