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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 | Jul. 31, 2012 | Mar. 31, 2021 | Mar. 31, 2020 | Mar. 31, 2019 | Jul. 28, 2006
Percentage of Automatic Increase in Shares Available for Issuance |  |  | 10.00% |  |  |  |
Share-based Payment Arrangement, Noncash Expense, Total |  |  |  | $ 3,307 | $ 2,822 | $ 3,097 |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number, Ending Balance (in shares) |  |  |  | 160,000 | 183,000 |  |
2006 Employee Equity Compensation Restricted Stock Plan (the "Employee Plan") | Restricted Stock [Member] |  |  |  |  |  |  |
Common Stock, Capital Shares Reserved for Future Issuance (in shares) |  |  |  | 972,175 |  |  | 1,000,000.0
2006 Outside Director Equity Compensation Restricted Stock Plan (the "Director Plan") [Member] | Restricted Stock [Member] |  |  |  |  |  |  |
Common Stock, Capital Shares Reserved for Future Issuance (in shares) |  |  | 400,000 | 272,000 |  |  | 200,000
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 |  |  | 219,039 |  |  |
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 |  |  |  |  |  |
2016 Outside Director Equity Compensation Restricted Stock Plan [Member] | Restricted Stock [Member] |  |  |  |  |  |  |
Common Stock, Capital Shares Reserved for Future Issuance (in shares) |  |  |  | 172,500 |  |  |
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) |  |  |  | 160,117 | 182,695 |  |
Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures, Total (in shares) |  |  |  | 102,931 | 105,925 |  |
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total |  |  |  | $ 2,500 | $ 2,600 |  |
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year) |  |  |  | 1 year 9 months 18 days | 1 year 9 months 18 days |  |

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