Note 5 - Capital Stock (Details Textual) - USD ($) $ / shares in Units, $ in Thousands			3 Months Ended
	Apr. 25, 2024	Jan. 18, 2024	Mar. 31, 2024	Mar. 31, 2023	Jul. 20, 2022
Share Repurchase Program, Authorized, Amount					$ 500,000
Share Repurchase Program, Remaining Authorized, Amount			$ 366,000
Treasury Stock, Shares, Acquired			126,000
Treasury Stock, Value, Acquired, Cost Method			$ 25,140	$ 30,849
Common Stock, Dividends, Per Share, Declared		$ 0.43
Subsequent Event [Member]
Common Stock, Dividends, Per Share, Declared	$ 0.43