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Note 12 - Acquisitions - Summary of Acquisitions (Details) - USD ($)
 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Dec. 31, 2015
Dec. 31, 2014
Acquisitions 2016 [Member]        
Cash paid, net of cash acquired $ 199,435,000      
Assets transferred 2,637,000      
202,072,000      
Inventories 112,406,000      
Franchise value 6,039,000      
Property and equipment 73,029,000      
Other current assets 305,000      
Other non-current assets 49,752      
Floor plan notes payable (7,558,000)      
Debt and capital lease obligations (23,465,000)      
Other current liabilities (5,850,000)      
Other non-current liabilities (9,605)      
195,053,000      
Goodwill 7,019,000      
202,072,000      
Cash paid, net of cash acquired 199,435,000 $ 34,920,000    
Assets transferred 2,637,000    
Goodwill [1] $ 219,021,000   $ 213,220,000 $ 199,375,000
[1] Net of accumulated impairment losses of $299.3 million recorded during the year ended December 31, 2008.