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Note 4 - Goodwill and Franchise Value (Tables)
 6 Months Ended
Jun. 30, 2015
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of Goodwill [Table Text Block]
   

Domestic

    

Import

    

Luxury

    

Consolidated

  

Balance as of December 31, 2013(1)

   $ 22,548     $ 16,797     $ 10,166     $ 49,511  

Additions through acquisitions

     68,463       62,804       18,597       149,864  

Balance as of December 31, 2014(1)

     91,011       79,601       28,763       199,375  

Reduction related to divestiture

     -       (246 )     -       (246 )

Balance as of June 30, 2015(1)

   $ 91,011     $ 79,355     $ 28,763     $ 199,129  
Schedule of Indefinite-Lived Intangible Assets [Table Text Block]
   

Franchise Value

  

Balance as of December 31, 2013

   $ 71,199  

Additions through acquisitions

     80,233  

Transfers to assets held for sale

     (540 )

Balance as of December 31, 2014

     150,892  

Reduction related to divestiture

     (36 )

Balance as of June 30, 2015

   $ 150,856