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Note 6 - Capital Stock (Details Textual) - USD ($) $ / shares in Units, $ in Thousands			3 Months Ended
	Apr. 22, 2021	Jan. 21, 2021	Mar. 31, 2021	Dec. 31, 2020	Mar. 31, 2020	Jan. 22, 2020	Apr. 20, 2017
Stock Repurchase Program, Authorized Amount						$ 500,000	$ 500,000
Stock Repurchase Program, Remaining Authorized Repurchase Amount			$ 498,000
Treasury Stock, Shares, Acquired (in shares)			34,000
Treasury Stock, Value, Acquired, Cost Method			$ 5,239		$ 75,193
Common Stock, Dividends, Per Share, Declared (in dollars per share)		$ 0.28	$ 0.28	$ 0.27	$ 0.27
Subsequent Event [Member]
Common Stock, Dividends, Per Share, Declared (in dollars per share)	$ 0.30
Dividends Payable, Date Declared	Apr. 22, 2021
Dividends Payable, Date to be Paid	May 21, 2021
Dividends Payable, Date of Record	May 07, 2021

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

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