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Note 7 - Stockholders' Equity and Stock Incentive Plans (Details Textual) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2021	Jun. 30, 2020
Stock Repurchased and Retired During Period, Shares (in shares)	0		0		0	700,000
Stock Repurchased and Retired During Period, Value			$ 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, 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	$ 900				$ 900
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)					1 year 3 months 18 days
Restricted Stock Units (RSUs) [Member]
Share-based Payment Arrangement, Nonvested Award, Excluding Option, Cost Not yet Recognized, Amount	14,500				$ 14,500
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)					2 years 1 month 6 days
Career Shares [Member]
Share-based Payment Arrangement, Nonvested Award, Excluding Option, Cost Not yet Recognized, Amount	1,600				$ 1,600
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)					4 years 2 months 12 days
The 2020 Plan [Member] | Share-based Payment Arrangement, Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)					3 years
The 2018 Plan [Member]
Stock Repurchase Program, Authorized Amount	100,000				$ 100,000
Stock Repurchase Program, Remaining Authorized Repurchase Amount	$ 61,400				$ 61,400

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