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Note 2 - Equity Compensation Plans and Capital Stock (Details Textual) - USD ($) | 12 Months Ended |
--- | --- | ---
Mar. 31, 2021 | Mar. 31, 2020 | Sep. 01, 2016
Cumulative Preferred Stock [Member] |  |  |
Preferred Stock, Shares Authorized (in shares) | 1,000,000 |  |
Preferred Stock, Par or Stated Value Per Share (in dollars per share) | $ 1 |  |
Preferred Stock, Shares Issued, Total (in shares) | 0 | 0 |
2016 Restricted Stock Plan [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in shares) |  |  | 500,000
2016 Restricted Stock Plan [Member] | Restricted Stock [Member] |  |  |
Share-based Payment Arrangement, Expense | $ 527,671 | $ 332,944 |
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total | $ 866,000 |  |
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year) | 2 years 255 days |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in shares) | 140,375 |  |

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