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Note 6 - Capital Stock	3 Months Ended
	Mar. 31, 2018
Notes to Financial Statements
Stockholders' Equity Note Disclosure [Text Block]	6 . Capital Stock On October 22, 2015, our Board of Directors authorized the purchase of $500 million of our common stock. On April 20, 2017, our Board of Directors authorized an additional purchase of up to $500 million of our common stock. At March 31, 2018, $521 million of the combined authorization was remaining. We did not purchase any shares under our repurchase authorization during the three months ended March 31, 2018. On January 24, 2018, we announced an increase in our quarterly cash dividend from $0.23 to $0.24, which was paid February 23, 201 8, to stockholders of record on February 9, 2018 . On April 19, 2018, our Board of Directors declared a regular quarterly dividend of $0.24 per common share, which will be paid on May 18, 2018 , to stockholders of record on May 4, 2018 .

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The entire disclosure for shareholders' equity comprised of portions attributable to the parent entity and noncontrolling interest, including other comprehensive income. Includes, but is not limited to, balances of common stock, preferred stock, additional paid-in capital, other capital and retained earnings, accumulated balance for each classification of other comprehensive income and amount of comprehensive income.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-URI http://asc.fasb.org/topic&trid=2208762

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