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Note 6 - Capital Stock (Details Textual) - USD ($) $ / shares in Units, $ in Thousands			3 Months Ended		9 Months Ended
	Oct. 21, 2021	Jul. 21, 2021	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Jan. 22, 2020	Apr. 20, 2017
Stock Repurchase Program, Authorized Amount							$ 500,000	$ 500,000
Stock Repurchase Program, Remaining Authorized Repurchase Amount			$ 366,000		$ 366,000
Treasury Stock, Shares, Acquired (in shares)			286,000		804,000
Treasury Stock, Value, Acquired, Cost Method			$ 50,336	$ (0)	$ 136,917	$ 75,193
Common Stock, Dividends, Per Share, Declared (in dollars per share)		$ 0.30
Dividends Payable, Date Declared		Jul. 21, 2021
Dividends Payable, Date to be Paid		Aug. 20, 2021
Dividends Payable, Date of Record		Aug. 06, 2021
Subsequent Event [Member]
Common Stock, Dividends, Per Share, Declared (in dollars per share)	$ 0.30
Dividends Payable, Date Declared	Oct. 21, 2021
Dividends Payable, Date to be Paid	Nov. 19, 2021
Dividends Payable, Date of Record	Nov. 05, 2021

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

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