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Note 9 - Incentive Plans (Details Textual) - USD ($) |  |  |  |  |  | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jul. 31, 2023 | Jun. 01, 2023 | Jun. 01, 2022 | Nov. 04, 2021 | Jun. 01, 2021 | Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022 | Dec. 31, 2022 | Jun. 30, 2023
Share-Based Payment Arrangement, Expense |  |  |  |  |  | $ 14,057,000 | $ 10,655,000 | $ 22,095,000 | $ 29,210,000 |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross |  |  |  |  |  |  |  | 1,949,000 |  | 1,564,500 |
Share-Based Payment Arrangement, Option [Member] |  |  |  |  |  |  |  |  |  |  |
Share-Based Payment Arrangement, Expense |  |  |  |  |  |  |  | $ 10,900,000 | 17,700,000 |  |
Share-Based Payment Arrangement, Nonvested Award, Option, Cost Not yet Recognized, Amount |  |  |  |  |  | 261,000 |  | 261,000 |  | $ 1,100,000 |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross | 1,949,000 |  |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Vested, Number of Shares | 1 |  |  |  |  |  |  |  |  |  |
Restricted Stock [Member] |  |  |  |  |  |  |  |  |  |  |
Share-Based Payment Arrangement, Expense |  |  |  |  |  |  |  | 5,400,000 | 5,400,000 |  |
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 |  |  |  |  |  | 7,800,000 |  | $ 7,800,000 |  |  |
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) |  | 58,767 | 21,184 |  | 67,779 |  |  | 58,767 |  |  |
Restricted Stock [Member] | Outside Directors [Member] | June 1, 2023 [Member] |  |  |  |  |  |  |  |  |  |  |
Share-Based Payment Arrangement, Expense |  |  |  |  |  |  |  | $ 253,000 |  |  |
Share-Based Payment Arrangement, Nonvested Award, Excluding Option, Cost Not yet Recognized, Amount |  |  |  |  |  |  |  |  |  |  | $ 505,000
Restricted Stock [Member] | Outside Directors [Member] | June 1, 2022 [Member] |  |  |  |  |  |  |  |  |  |  |
Share-Based Payment Arrangement, Expense |  |  |  |  |  |  |  | 305,000 | 244,000 |  |
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 |  |  |  |  |  |  |  | 5,300,000 | 5,000,000.0 |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized (in shares) |  |  |  | 600,000 |  |  |  |  |  |  |
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total |  |  |  |  |  | $ 7,600,000 |  | $ 7,600,000 |  |  |
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 |  |  |  |  |  |  |  | $ 176,000 | $ 210,000 |  |

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