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Note 17 - Stockholders' Equity (Details Textual) - USD ($) | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Mar. 31, 2023 | Mar. 31, 2022 | Aug. 02, 2022 | Aug. 01, 2019 | Jul. 31, 2019
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares) | 20,564 | 0 |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value | $ 2,600,000 | $ 7,600,000 |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) | 914,306 |  |  |  |
Share-Based Payment Arrangement, Expense | $ 4,729,000 | 4,661,000 |  |  |
Share-Based Payment Arrangement, Option [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year) | 2 years |  |  |  |
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total | $ 100,000 |  |  |  |
Share-Based Payment Arrangement, Expense | 32,000 | 3,000 |  |  |
Restricted Stock [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Grant Date Fair Value | 4,700,000 | 8,200,000 |  |  |
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total | $ 4,700,000 |  |  |  |
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year) | 1 year 8 months 12 days |  |  |  |
Share-Based Payment Arrangement, Expense | $ 4,656,000 | $ 4,615,000 |  |  |
Performance Shares [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year) | 3 years | 3 years |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) | 200,000 | 76,500 |  |  |
The 2022 Stock Incentive Plan [Member] |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized (in shares) |  |  | 1,150,000 |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant (in shares) | 654,610 |  |  |  |
The 2007 Director Plan [Member] |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized (in shares) |  |  |  | 280,000 | 430,000
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year) | 2 years |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Grant Date Fair Value | $ 40,000 |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Grant Date Fair Value | $ 50,000 |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant (in shares) | 176,471 |  |  |  |
The 2007 Plan [Member] | Share-Based Payment Arrangement, Option [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year) | 10 years |  |  |  |
The 2007 Plan [Member] | Share-Based Payment Arrangement, Option [Member] | Minimum [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year) | 3 years |  |  |  |
The 2007 Plan [Member] | Share-Based Payment Arrangement, Option [Member] | Maximum [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year) | 5 years |  |  |  |
The 2007 Plan [Member] | Restricted Stock [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year) | 3 years |  |  |  |
Employee Stock Purchase Plan [Member] |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant (in shares) | 99,906 |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Discount from Market Price, Offering Date |  | 15.00% |  |  |
Share-Based Payment Arrangement, Expense | $ 100,000 | $ 100,000 |  |  |

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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(01) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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