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Note 4 - Goodwill and Franchise Value - Goodwill (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2017
Dec. 31, 2016
Balance [1] $ 259,399 $ 213,220
Additions through acquisitions 47,397 [2]
Reductions through divestitures (1,218)
Balance [1] 259,399 259,399
Domestic [Member]    
Balance [1] 114,839 97,903
Additions through acquisitions 18,154 [2]
Reductions through divestitures (1,218)
Balance [1] 114,839 114,839
Import [Member]    
Balance [1] 106,179 84,384
Additions through acquisitions 21,795 [2]
Reductions through divestitures
Balance [1] 106,179 106,179
Luxury [Member]    
Balance [1] 38,381 30,933
Additions through acquisitions 7,448 [2]
Reductions through divestitures
Balance [1] $ 38,381 $ 38,381
[1] Net of accumulated impairment losses of $299.3 million recorded during the year ended December 31, 2008.
[2] Our purchase price allocation is preliminary for the acquisitions related to the Carbone Auto Group. The initial purchase price allocation is subject to change upon final valuation analysis. The primary balances still subject to analysis are certain intangible assets.