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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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