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Note 1 - Summary of Significant Accounting Policies (Details Textual) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($)
Number of New Vehicle Brands | 30 |  |
Number of Stores | 154 |  |
Interest Costs Capitalized | $ 0.4 | $ 0.5 | $ 0.4
Number of Financial Institutions | 18 |  |
Number of Manufacturer Affiliated Finance Companies | 8 |  |
Long-term Debt, Percentage Bearing Variable Interest, Amount | $ 2,100.0 |  |
Standard and Extended Product Warranty Accrual | $ 0.4 | $ 0.5 |
Number of Reportable Segments | 3 |  |
Minimum [Member] |  |  |
Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate | 2.02% |  |
Maximum [Member] |  |  |
Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate | 3.25% |  |

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