Note 1 - Summary of Significant Accounting Policies (Details Textual) $ in Millions	12 Months Ended
	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)
Minimum [Member]
Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate	1.49%
Maximum [Member]
Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate	3.00%
Number of New Vehicle Brands	31
Number of Stores	137
Interest Costs Capitalized	$ 0.5	$ 0.4	$ 0.1
Number of Financial Institutions	18
Number of Manufacturer Affiliated Finance Companies	8
Long-term Debt, Percentage Bearing Variable Interest, Amount	$ 1,700.0
Product Warranty Accrual	$ 0.5	$ 0.4
Number of Reportable Segments	3