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Note 21 - Subsequent Events (Details Textual) - USD ($) $ / shares in Units, $ in Thousands |  |  |  |  | 12 Months Ended | 53 Months Ended
--- | --- | --- | --- | --- | --- | ---
Feb. 26, 2016 | Feb. 22, 2016 | Feb. 01, 2016 | Jan. 26, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2015
Subsequent Event [Member] | Common Class A [Member] | Share Repurchase Plan [Member] |  |  |  |  |  |  |  |
Stock Repurchased During Period, Shares | 594,123 |  |  |  |  |  |  |
Treasury Stock Acquired, Average Cost Per Share | $ 79.11 |  |  |  |  |  |  |
Stock Repurchase Program, Remaining Number of Shares Authorized to be Repurchased | 677,364 |  |  |  |  |  |  |
Subsequent Event [Member] | Common Class A [Member] |  |  |  |  |  |  |  |
Common Stock, Dividends, Per Share, Declared |  | $ 0.20 |  |  |  |  |  |
Subsequent Event [Member] | Common Class B [Member] |  |  |  |  |  |  |  |
Common Stock, Dividends, Per Share, Declared |  | $ 0.20 |  |  |  |  |  |
Subsequent Event [Member] | Riverside Subaru [Member] |  |  |  |  |  |  |  |
Payments to Acquire Businesses, Net of Cash Acquired |  |  |  | $ 3,600 |  |  |  |
Subsequent Event [Member] | Ira Toyota / Scion [Member] |  |  |  |  |  |  |  |
Payments to Acquire Businesses, Net of Cash Acquired |  |  | $ 6,500 |  |  |  |  |
Subsequent Event [Member] |  |  |  |  |  |  |  |
Dividends, Common Stock, Cash |  | $ 5,100 |  |  |  |  |  |
Common Class A [Member] | Share Repurchase Plan [Member] |  |  |  |  |  |  |  |
Treasury Stock Acquired, Average Cost Per Share |  |  |  |  | $ 107.88 | $ 70.52 | $ 40.76 |
Common Class A [Member] |  |  |  |  |  |  |  |
Stock Repurchased During Period, Shares |  |  |  |  | 228,737 | 226,729 | 127,900 | 1,700,000
Treasury Stock Acquired, Average Cost Per Share |  |  |  |  |  |  |  | $ 41.34
Stock Repurchase Program, Remaining Number of Shares Authorized to be Repurchased |  |  |  |  | 1,300,000 |  |  | 1,300,000
Payments to Acquire Businesses, Net of Cash Acquired |  |  |  |  | $ 71,615 | $ 659,634 | $ 81,105 |

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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 a business, net of the cash acquired from the purchase. + References Reference 1: 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=56944662&loc=d3e3213-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 + Details
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- Definition Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30 -Article 5 + Details
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