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Note 7 - Stockholders' Equity and Stock Incentive Plans (Details Textual) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Mar. 31, 2022 | Mar. 31, 2021 | Jun. 30, 2022 | Jun. 01, 2022 | Oct. 21, 2021
Performance Shares [Member] |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Shares Issued in Period (in shares) | 408,609 | 90,444 |  |  |
Shares Issued Per Unit (in shares) | 1.58 | 0.33 |  |  |
Share-Based Payment Arrangement, Shares Withheld for Tax Withholding Obligation (in shares) | 114,265 | 30,129 |  |  |
Share Based Payment Arrangement, Shares Issued In Period, Net of Tax Withholdings (in shares) | 294,344 | 60,315 |  |  |
Share-Based Payment Arrangement, Nonvested Award, Excluding Option, Cost Not yet Recognized, Amount |  |  | $ 5.7 |  |
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, Excluding Option, Cost Not yet Recognized, Amount |  |  | $ 13.5 |  |
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 |  |  | $ 1.7 |  |
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year) |  |  | 3 years 9 months 18 days |  |
The 2021 Program [Member] |  |  |  |  |
Stock Repurchase Program, Authorized Amount |  |  |  |  | $ 300.0
Stock Repurchase Program, Increase in Authorized Amount |  |  |  | $ 500.0 |
Stock Repurchase Program, Remaining Authorized Repurchase Amount |  |  | $ 480.8 |  |

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