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Note 9 - Segments - Certain Segment Financial Information (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Total revenues $ 2,236,101 $ 1,982,861
Income from continuing operations before income taxes 81,263 60,021
Depreciation and amortization (12,739) (11,663)
Other interest expense, net (6,671) (5,459)
Other income (expense), net 9,845 (1,526)
Income before income taxes 81,263 60,021
Floor plan interest expense:    
Floor plan interest expense 8,052 5,909
Operating Segments [Member]    
Total revenues 2,235,034 1,981,458
Income from continuing operations before income taxes [1] 52,327 51,978
Income before income taxes [1] 52,327 51,978
Floor plan interest expense:    
Floor plan interest expense 16,903 13,387
Operating Segments [Member] | Domestic [Member]    
Total revenues 899,759 771,902
Income from continuing operations before income taxes [1] 25,442 23,132
Income before income taxes [1] 25,442 23,132
Floor plan interest expense:    
Floor plan interest expense 7,954 6,496
Operating Segments [Member] | Import [Member]    
Total revenues 971,472 862,743
Income from continuing operations before income taxes [1] 22,172 24,263
Income before income taxes [1] 22,172 24,263
Floor plan interest expense:    
Floor plan interest expense 5,873 4,234
Operating Segments [Member] | Luxury [Member]    
Total revenues 363,803 346,813
Income from continuing operations before income taxes [1] 4,713 4,583
Income before income taxes [1] 4,713 4,583
Floor plan interest expense:    
Floor plan interest expense 3,076 2,657
Corporate, Non-Segment [Member]    
Total revenues 1,067 1,403
Income from continuing operations before income taxes [1] 38,501 26,691
Income before income taxes [1] 38,501 26,691
Floor plan interest expense:    
Floor plan interest expense $ (8,851) $ (7,478)
[1] Segment income for each of the segments is defined as income before income taxes, depreciation and amortization, other interest expense and other expense, net.