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Note 6 - Capital Stock (Details Textual) - USD ($) $ / shares in Units, $ in Millions					3 Months Ended		9 Months Ended
	Nov. 18, 2016	Oct. 20, 2016	Aug. 19, 2016	Jul. 21, 2016	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Oct. 22, 2015
Subsequent Event [Member]
Common Stock, Dividends, Per Share, Declared		$ 0.22
Scenario, Forecast [Member]
Common Stock, Dividends, Per Share, Cash Paid	$ 0.22
Stock Repurchase Program, Authorized Amount									$ 500.0
Stock Repurchase Program, Remaining Authorized Repurchase Amount					$ 276.0		$ 276.0
Treasury Stock, Shares, Acquired							2,228,000
Treasury Stock, Value, Acquired							$ 174.8
Common Stock, Dividends, Per Share, Declared				$ 0.22	$ 0.22	$ 0.21	$ 0.66	$ 0.63
Common Stock, Dividends, Per Share, Cash Paid			$ 0.22

X

- Definition

Value of the shares that have been repurchased during the period and are being held in treasury.

+ References

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- Definition

Aggregate dividends paid 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

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-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
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+ References

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-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
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