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Note 8 - Stockholders' Equity and Stock Incentive Plans (Details Textual) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Jun. 30, 2023	May 04, 2023	Jun. 01, 2022	Oct. 21, 2021
Performance Shares [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Shares Issued in Period (in shares)	519,782	408,609
Shares Issued Per Unit (in shares)	2.00	1.58
Share-Based Payment Arrangement, Shares Withheld for Tax Withholding Obligation (in shares)	200,904	114,265
Share Based Payment Arrangement, Shares Issued In Period, Net of Tax Withholdings (in shares)	318,878	294,344
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount			$ 5.6
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)			2 years 2 months 12 days
Restricted Stock Units (RSUs) [Member]
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount			$ 15.5
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)			2 years 2 months 12 days
Career Shares [Member]
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount			$ 1.7
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)			3 years 7 months 6 days
The 2021 Program [Member]
Stock Repurchase Program, Authorized Amount					$ 500.0	$ 300.0
Stock Repurchase Program, Increase in Authorized Amount				$ 500.0
Stock Repurchase Program, Remaining Authorized Repurchase Amount			$ 532.6

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Shares issued during the period net of tax withholding for share based payment arrangements

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 718
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (i)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480429/718-10-50-2

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