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Note 12 - Stock Repurchase Program (Details Textual) - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended		3 Months Ended						9 Months Ended		98 Months Ended
	Aug. 31, 2022	Sep. 30, 2020	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Aug. 05, 2022
Stock Repurchase Program, Authorized Amount		$ 250,000										$ 500,000
Stock Repurchase Program, Period in Force (Month)	24 years	24 months
Treasury Stock, Value, Acquired, Cost Method			$ 100,267			$ 123,900			$ 100,267	$ 123,900
Treasury Stock, Common [Member]
Treasury Stock, Shares, Acquired (in shares)			875,580			536,633			875,580	536,633
Treasury Stock, Value, Acquired, Cost Method			$ 100,267			$ 123,900			$ 100,267	$ 123,900
Stock Repurchase Program [Member] | Treasury Stock, Common [Member]
Treasury Stock, Shares, Acquired (in shares)			875,580	0	0	536,633	0	0			12,624,293
Treasury Stock, Value, Acquired, Cost Method			$ 100,267			$ 123,900					$ 877,396
Shares Acquired, Average Cost Per Share (in dollars per share)											$ 69.5

X

- Definition

Amount of stock repurchase plan authorized.

+ References

No definition available.

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X

- Definition

Period which shares may be purchased under a stock repurchase plan authorized by an entity's Board of Directors, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

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- Definition

Total cost of shares repurchased divided by the total number of shares repurchased.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 505
-SubTopic 30
-Section 45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481549/505-30-45-1

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- Definition

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

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-SubTopic 10
-Topic 505
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481112/505-10-50-2

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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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-Section S99
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-Publisher FASB
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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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-Name Accounting Standards Codification
-Section 50
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