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Note 4 - Goodwill and Franchise Value (Tables)
 6 Months Ended
Jun. 30, 2016
Notes Tables  
Schedule of Goodwill [Table Text Block]
 
 
Domestic
 
 
Import
 
 
Luxury
 
 
Consolidated
 
Balance as of December 31, 2014 ¹
   $ 91,011     $ 79,601     $ 28,763     $ 199,375  
Additions through acquisitions
     6,892       5,029       2,170       14,091  
Reduction related to divestiture
     —       (246
)
     —       (246
)
Balance as of December 31, 2015 ¹
     97,903       84,384       30,933       213,220  
Additions through acquisitions
     966       1,283       193       2,442  
Reduction related to divestiture
     (1,218
)
     —       —       (1,218
)
Balance as of June 30, 2016 ¹
   $ 97,651     $ 85,667     $ 31,126     $ 214,444  
Schedule of Indefinite-Lived Intangible Assets [Table Text Block]
 
 
Franchise Value
 
Balance as of December 31, 2014
   $ 150,892  
Additions through acquisitions
     6,843  
Reduction related to divestiture
     (36
)
Balance as of December 31, 2015
     157,699  
Additions through acquisitions
     5,115  
Reduction related to divestiture
     (518
)
Balance as of June 30, 2016
   $ 162,296