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Note 9 - Incentive Plans (Details Textual) - USD ($) |  |  |  | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Jun. 01, 2022 | Nov. 04, 2021 | Jun. 01, 2021 | Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021 | Dec. 31, 2021
Share-Based Payment Arrangement, Expense |  |  |  | $ 14,579,000 | $ 1,023,000 | $ 18,555,000 | $ 1,989,000 |
Share-Based Payment Arrangement, Option [Member] |  |  |  |  |  |  |  |
Share-Based Payment Arrangement, Expense |  |  |  |  |  | 10,800,000 | 1,900,000 |
Share-Based Payment Arrangement, Nonvested Award, Option, Cost Not yet Recognized, Amount |  |  |  | 1,900,000 |  | $ 1,900,000 |  | $ 1,800,000
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year) |  |  |  |  |  | 2 years |  |
Restricted Stock [Member] |  |  |  |  |  |  |  |
Share-Based Payment Arrangement, Expense |  |  |  |  |  | $ 3,600,000 |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized (in shares) |  | 1,500,500 |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year) |  | 3 years |  |  |  |  |  |
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total |  |  |  | 16,800,000 |  | 16,800,000 |  |
Restricted Stock [Member] | Outside Directors [Member] |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) | 21,184 |  | 67,779 |  |  |  |  |
Restricted Stock [Member] | Outside Directors [Member] | June 1, 2022 [Member] |  |  |  |  |  |  |  |
Share-Based Payment Arrangement, Expense |  |  |  |  |  | 61,000 |  |
Share-Based Payment Arrangement, Nonvested Award, Excluding Option, Cost Not yet Recognized, Amount |  |  |  | $ 672,000 |  | 672,000 |  |
Restricted Stock [Member] | Outside Directors [Member] | June 1, 2021 [Member] |  |  |  |  |  |  |  |
Share-Based Payment Arrangement, Expense |  |  |  |  |  | 284,000 |  |
Contractual Equity-based Bonus [Member] |  |  |  |  |  |  |  |
Share-Based Payment Arrangement, Expense |  |  |  |  |  | $ 3,800,000 |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized (in shares) |  | 600,000 |  |  |  |  |  |
The 401K Plan [Member] |  |  |  |  |  |  |  |
Defined Contribution Plan, Period of Employment for Eligibility (Month) |  |  |  |  |  | 3 months |  |
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Percent |  |  |  |  |  | 80.00% |  |
Defined Contribution Plan, Employer Matching Contribution, Percent of Match |  |  |  |  |  | 100.00% |  |
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay |  |  |  |  |  | 4.00% |  |
Defined Contribution Plan, Employer Discretionary Contribution Amount |  |  |  |  |  | $ 141,000 | $ 111,000 |

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