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Note 6 - Capital Stock (Details Textual) - USD ($) $ / shares in Units, $ in Thousands			3 Months Ended		6 Months Ended
	Jul. 22, 2020	Apr. 23, 2020	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Jan. 22, 2020	Apr. 20, 2017
Stock Repurchase Program, Authorized Amount							$ 500,000	$ 500,000
Stock Repurchase Program, Remaining Authorized Repurchase Amount			$ 520,000		$ 520,000
Treasury Stock, Shares, Acquired (in shares)			0		800,000
Treasury Stock, Value, Acquired, Cost Method			$ 0	$ 189,734	$ 75,193	$ 189,734
Dividends Payable, Date Declared		Apr. 23, 2020
Common Stock, Dividends, Per Share, Declared (in dollars per share)		$ 0.27	$ 0.27	$ 0.26	$ 0.54	$ 0.52
Dividends Payable, Date to be Paid		May 22, 2020
Dividends Payable, Date of Record		May 08, 2020
Subsequent Event [Member]
Dividends Payable, Date Declared	Jul. 22, 2020
Common Stock, Dividends, Per Share, Declared (in dollars per share)	$ 0.27

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

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