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Note 4 - Capital Stock (Details Textual) - USD ($) $ / shares in Units, $ in Thousands			1 Months Ended	12 Months Ended
	Feb. 24, 2023	Jul. 20, 2022	Feb. 24, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Common Stock, Dividends, Per Share, Declared		$ 0.40
Treasury Stock, Shares, Acquired				1,710,000
Treasury Stock, Value, Acquired, Cost Method				$ 300,030	$ 151,720	$ 92,548
Stock Repurchase Program, Remaining Authorized Repurchase Amount				$ 551,100
Exercise or Vesting [Member]
Common Stock, Capital Shares Reserved for Future Issuance (in shares)				1,500,000
Future Issuance [Member]
Common Stock, Capital Shares Reserved for Future Issuance (in shares)				4,200,000
Subsequent Event [Member]
Common Stock, Dividends, Per Share, Declared			$ 0.42
Dividends Payable, Date to be Paid	Feb. 24, 2023
Dividends Payable, Date of Record	Feb. 10, 2023

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Aggregate number of common shares reserved for future issuance.

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