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Note 7 - Stockholders' Equity and Stock Incentive Plans (Details Textual) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended					9 Months Ended
	Sep. 30, 2021	Mar. 31, 2021	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2021	Sep. 30, 2020	Oct. 21, 2021	Dec. 12, 2018
Stock Repurchased and Retired During Period, Shares (in shares)	0		0			0	700,000
Stock Repurchased and Retired During Period, Value			$ (0)	$ 1	$ 11,120		$ 11,100
Shares Repurchased, Average Price Per Share (in dollars per share)							$ 16.29
Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)						3 years
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period (in shares)		90,444			364,810
Shares Issued Per Unit (in shares)		0.33			1.53
Share-based Payment Arrangement, Shares Withheld for Tax Withholding Obligation (in shares)		30,129			126,465
Share Based Payment Arrangement, Shares Issued In Period, Net of Tax Withholdings (in shares)		60,315			238,345
Share-based Payment Arrangement, Nonvested Award, Excluding Option, Cost Not yet Recognized, Amount	$ 5,400					$ 5,400
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)						1 year 8 months 12 days
Restricted Stock Units (RSUs) [Member]
Share-based Payment Arrangement, Nonvested Award, Excluding Option, Cost Not yet Recognized, Amount	8,700					$ 8,700
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)						1 year 10 months 24 days
Career Shares [Member]
Share-based Payment Arrangement, Nonvested Award, Excluding Option, Cost Not yet Recognized, Amount	1,500					$ 1,500
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)						3 years 9 months 18 days
The 2018 Plan [Member]
Stock Repurchase Program, Authorized Amount									$ 100,000
Stock Repurchase Program, Remaining Authorized Repurchase Amount	$ 61,400					$ 61,400
The 2021 Program [Member]
Stock Repurchase Program, Authorized Amount								$ 300,000

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