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Note 5 - Capital Stock (Details Textual) - USD ($) $ / shares in Units, $ in Thousands			3 Months Ended		9 Months Ended
	Oct. 19, 2023	Jul. 19, 2023	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Jul. 20, 2022
Stock Repurchase Program, Authorized Amount							$ 500,000
Stock Repurchase Program, Remaining Authorized Repurchase Amount			$ 416,000		$ 416,000
Treasury Stock, Shares, Acquired			267,000		765,000
Treasury Stock, Value, Acquired, Cost Method			$ 51,101	$ 60,690	$ 135,036	$ 300,030
Common Stock, Dividends, Per Share, Declared		$ 0.42
Subsequent Event [Member]
Common Stock, Dividends, Per Share, Declared	$ 0.42

X

- Definition

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

+ References

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-Topic 505
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-Publisher FASB
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- Definition

Amount of stock repurchase plan authorized.

+ References

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Amount remaining of a stock repurchase plan authorized.

+ References

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- Definition

Number of shares that have been repurchased during the period and are being held in treasury.

+ References

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- Definition

Equity impact of the cost of common and preferred stock that were repurchased during the period. Recorded using the cost method.

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