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Note 14 - Subsequent Events (Details Textual) - USD ($) $ / shares in Units, $ in Millions |  |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | --- | ---
Oct. 18, 2016 | Oct. 05, 2016 | Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015
Subsequent Event [Member] | Common Class B [Member] |  |  |  |  |  |
Common Stock, Dividends, Per Share, Declared | $ 0.25 |  |  |  |  |
Subsequent Event [Member] | Common Class A [Member] |  |  |  |  |  |
Common Stock, Dividends, Per Share, Declared | $ 0.25 |  |  |  |  |
Subsequent Event [Member] | Audi Auto Gallery [Member] |  |  |  |  |  |
Payments to Acquire Businesses, Gross |  | $ 22.4 |  |  |  |
Subsequent Event [Member] |  |  |  |  |  |
Dividends, Common Stock, Cash | $ 6.3 |  |  |  |  |
Common Stock, Dividends, Per Share, Declared |  |  | $ 0.25 | $ 0.20 | $ 0.70 | $ 0.56

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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 Amount of paid and unpaid common stock dividends declared with the form of settlement in cash. + 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 The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3213-108585 + Details
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