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Note 11 - Stockholders' Equity (Details Textual) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended		87 Months Ended
	Sep. 30, 2022	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	May 20, 2022	Dec. 31, 2021	Jul. 01, 2015
Treasury Stock, Shares, Total (in shares)	347,439	347,439		347,439		129,037
Stock Repurchase Program, Authorized Amount	$ 288,100	$ 288,100		$ 288,100	$ 450,000		$ 250,000
Stock Repurchase Program, Number of Shares Authorized to be Repurchased (in shares)							600,000
Treasury Stock, Shares, Acquired (in shares)		232,637		443,268
Treasury Stock, Value, Acquired, Cost Method	$ 115,322	$ 307,031		$ 411,900
Payment, Tax Withholding, Share-Based Payment Arrangement		$ 4,826	$ 8,035
Share-Based Payment Arrangement, Shares Withheld for Tax Withholding Obligation (in shares)		2,790	3,650

X

- Definition

Amount of cash outflow to satisfy grantee's tax withholding obligation for award under share-based payment arrangement.

+ References

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-Publisher FASB
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-Topic 230
-SubTopic 10
-Section 45
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Number of shares used to settle grantee's tax withholding obligation for award under share-based payment arrangement.

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Amount of stock repurchase plan authorized.

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The number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan.

+ References

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Number of common and preferred shares that were previously issued and that were repurchased by the issuing entity and held in treasury on the financial statement date. This stock has no voting rights and receives no dividends.

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

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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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