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Note 11 - Stockholders' Equity (Details Textual) - USD ($) $ in Thousands	1 Months Ended	9 Months Ended		75 Months Ended
	May 31, 2020	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Dec. 31, 2020	Jul. 01, 2015
Stock Issued During Period, Shares, New Issues (in shares)	287,500
Proceeds from Issuance of Common Stock, Net	$ 469,800
Treasury Stock, Shares, Ending Balance (in shares)		130,467		130,467	147,695
Stock Repurchase Program, Authorized Amount						$ 250,000
Stock Repurchase Program, Number of Shares Authorized to be Repurchased (in shares)						600,000
Treasury Stock, Shares, Acquired (in shares)		0		210,631
Treasury Stock, Value, Acquired, Cost Method				$ 104,900
Payment, Tax Withholding, Share-based Payment Arrangement		$ 8,035	$ 5,861
Share-based Payment Arrangement, Shares Withheld for Tax Withholding Obligation (in shares)		3,650	3,810
Revolving Credit Facility [Member]
Repayments of Debt	$ 100,000

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- Definition

The cash inflow from the additional capital contribution to the entity, net of offering expenses.

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

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The cash outflow during the period from the repayment of aggregate short-term and long-term debt. Excludes payment of capital lease obligations.

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Number of new stock issued during the period.

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

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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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