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Note 13 - Subsequent Events (Details Textual) - USD ($) $ / shares in Units, $ in Millions |  |  | 1 Months Ended
--- | --- | --- | ---
Apr. 29, 2016 | Apr. 19, 2016 | Mar. 31, 2016
Subsequent Event [Member] | Common Class B [Member] |  |  |
Common Stock, Dividends, Per Share, Declared |  | $ 0.25 |
Subsequent Event [Member] | Common Class A [Member] | Share Repurchase Plan [Member] |  |  |
Stock Repurchased During Period, Shares | 162,000 |  |
Treasury Stock Acquired, Average Cost Per Share | $ 81.10 |  |
Subsequent Event [Member] | Common Class A [Member] | The 2016 Stock Repurchase Authorization [Member] |  |  |
Stock Repurchase Program, Remaining Authorized Repurchase Amount | $ 235.1 |  |
Subsequent Event [Member] | Common Class A [Member] |  |  |
Common Stock, Dividends, Per Share, Declared |  | $ 0.25 |
Subsequent Event [Member] |  |  |
Dividends, Common Stock, Cash |  | $ 6.4 |
Common Class A [Member] | The 2016 Stock Repurchase Authorization [Member] |  |  |
Stock Repurchased During Period, Shares |  |  | 19,000
Treasury Stock Acquired, Average Cost Per Share |  |  | $ 92.20
Stock Repurchase Program, Remaining Authorized Repurchase Amount |  |  | $ 248.2

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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 Amount remaining of a stock repurchase plan authorized. + References No definition available. + 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 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: 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 Reference 3: 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(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: 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 + Details
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- Definition Total cost of shares repurchased divided by the total number of shares repurchased. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655 + Details
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