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Note 7 - Restricted Stock (Details Textual) - USD ($) $ in Thousands | 1 Months Ended | 12 Months Ended
--- | --- | ---
Jul. 31, 2016 | Jul. 31, 2015 | Mar. 31, 2022 | Mar. 31, 2021 | Mar. 31, 2020
Share-Based Payment Arrangement, Noncash Expense, Total |  |  | $ 4,549 | $ 3,307 | $ 2,822
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number, Ending Balance (in shares) |  |  | 771,000 | 160,000 |
2015 Outside Director Equity Compensation Restricted Stock Plan [Member] | Restricted Stock [Member] |  |  |  |  |
Common Stock, Capital Shares Reserved for Future Issuance (in shares) |  | 400,000 |  |  |
Percentage of Automatic Increase in Shares Available for Issuance |  | 10.00% |  |  |
2016 Employee Equity Compensation Restricted Stock Plan [Member] | Restricted Stock [Member] |  |  |  |  |
Common Stock, Capital Shares Reserved for Future Issuance (in shares) | 1,000,000 |  | 893,258 |  |
2016 Employee Equity Compensation Restricted Stock Plan [Member] | Restricted Stock [Member] | Minimum [Member] |  |  |  |  |
Restriction Period (Year) | 1 year |  |  |  |
2016 Employee Equity Compensation Restricted Stock Plan [Member] | Restricted Stock [Member] | Maximum [Member] |  |  |  |  |
Restriction Period (Year) | 10 years |  |  |  |
2015 Outside Director Equity Compensation Restricted Stock Plan ("2015 Director Plan") [Member] | Restricted Stock [Member] |  |  |  |  |
Common Stock, Capital Shares Reserved for Future Issuance (in shares) |  |  | 208,880 |  |
Employee and Director Equity Compensation Plan [Member] | Non-vested Restricted Stock [Member] |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number, Ending Balance (in shares) |  |  | 770,652 | 160,117 |
Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures, Total (in shares) |  |  | 709,599 | 102,931 |
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total |  |  | $ 13,400 | $ 2,500 |
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year) |  |  | 2 years 3 months 18 days | 1 year 9 months 18 days |

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