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Note 5 - Capital Stock (Details Textual) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended			6 Months Ended
	Jul. 17, 2024	Jun. 30, 2024	Mar. 31, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023	Jul. 20, 2022
Share Repurchase Program, Authorized, Amount							$ 500,000
Share Repurchase Program, Remaining Authorized, Amount		$ 163,000			$ 163,000
Treasury Stock, Shares, Acquired		1,225,000			1,350,700
Treasury Stock, Value, Acquired, Cost Method		$ 203,145		$ 53,086	$ 228,285	$ 83,935
Common Stock, Dividends, Per Share, Declared		$ 0.43	$ 0.43
Subsequent Event [Member]
Common Stock, Dividends, Per Share, Declared	$ 0.43

X

- Definition

Amount authorized for purchase of share under share repurchase plan. Includes, but is not limited to, repurchase of stock and unit of ownership.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 505
-SubTopic 30
-Name Accounting Standards Codification
-Section 50
-Paragraph 4
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481520/505-30-50-4

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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
-URI https://asc.fasb.org/1943274/2147480008/505-10-S99-1

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- Definition

Amount remaining authorized for purchase of share under share repurchase plan. Includes, but is not limited to, repurchase of stock and unit of ownership.

+ References

No definition available.

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

+ References

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-Section 50
-Paragraph 2
-SubTopic 10
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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.

+ References

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