Aggregate dividends declared during the period for each share of common stock outstanding.

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)
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Amount of paid and unpaid common stock dividends declared with the form of settlement in cash.

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Amount remaining of a stock repurchase plan authorized.

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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.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Total cost of shares repurchased divided by the total number of shares repurchased.

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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