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Note 1 - Summary of Significant Accounting Policies (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended 0 Months Ended 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2013
Revolving Credit Facility [Member]
Dec. 31, 2013
Revolving Credit Facility [Member]
Dec. 31, 2013
Minimum [Member]
Dec. 31, 2013
Maximum [Member]
Note 1 - Summary of Significant Accounting Policies (Details) [Line Items]              
Number of New Vehicle Brands 28            
Number of Stores 94            
Interest Costs Capitalized $ 0.1 $ 0.3 $ 0.2        
Advertising Expense 39.6 31.9 23.9        
Cooperative Advertising Amount 11.8 9.6 7.8        
Number of Financial Institutions       13 13    
Number of Manufacturer Affiliated Finance Companies       7 7    
Debt Instrument, Term       5 years 5 years    
Long-term Debt, Percentage Bearing Variable Interest, Amount 833.8            
Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate           1.40% 3.00%
Product Warranty Accrual $ 0.5 $ 0.3