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Note 13 - Subsequent Events (Details Textual) - Subsequent Event [Member] $ / shares in Units, $ in Millions | Jul. 25, 2016 USD ($) $ / shares | Jul. 27, 2016 USD ($)
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Common Class A [Member] |  |
Common Stock, Dividends, Per Share, Declared | $ / shares | $ 0.25 |
Common Class B [Member] |  |
Common Stock, Dividends, Per Share, Declared | $ / shares | $ 0.25 |
Syndicated Credit Facility [Member] | Used Vehicle Inventory Financing [Member] |  |
Line of Credit Facility, Maximum Borrowing Capacity |  | $ 350.0
Syndicated Credit Facility [Member] | General Corporate Purposes [Member] |  |
Line of Credit Facility, Maximum Borrowing Capacity |  | 400.0
Syndicated Credit Facility [Member] | Scenario Subject to Lender Approval [Member] |  |
Line of Credit Facility, Maximum Borrowing Capacity |  | 2,400.0
Syndicated Credit Facility [Member] |  |
Increase in Line of Credit Facility Maximum Borrowing Capacity |  | 300.0
Line of Credit Facility, Maximum Borrowing Capacity |  | $ 2,050.0
Number of Financial Institutions |  | 18
Number of Manufacturer Affiliated Finance Companies |  | 8
Dividends, Common Stock, Cash | $ 6.4 |

X
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- Definition Aggregate dividends declared during the period for each share of common stock outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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