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Note 6 - Shareholders' Equity (Details Textual) - USD ($) |  |  |  |  | 1 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jan. 25, 2019 | Aug. 12, 2011 | Nov. 01, 2010 | Oct. 31, 2008 | Apr. 30, 1998 | Mar. 31, 2021 | Mar. 31, 2020 | Mar. 31, 2019 | May 04, 2020 | Jul. 23, 2018 | Nov. 08, 2006
Preferred Stock, Shares Issued, Total (in shares) |  |  |  |  | 250,000 | 3,000 | 3,000 |  |  |  |
Shares Issued, Price Per Share (in dollars per share) |  |  |  |  | $ 4.00 |  |  |  |  |  |
Payments of Stock Issuance Costs |  |  |  |  | $ 112,187 |  |  |  |  |  |
Convertible Preferred Stock, Shares Issued upon Conversion (in shares) |  |  |  |  | 4.05 |  |  |  |  |  |
Preferred Stock, Liquidation Preference Per Share (in dollars per share) |  |  |  |  | $ 4.00 | $ 4 | $ 4 |  |  |  |
Preferred Stock, Shares Outstanding, Ending Balance (in shares) |  |  |  |  |  | 3,000 | 3,000 |  |  |  |
Stock Repurchase Program, Authorized Amount |  |  |  |  |  |  |  |  |  |  | $ 20,000,000.0
Stock Repurchase Program, Additional Authorized Amount | $ 30,000,000.0 | $ 20,000,000.0 | $ 20,000,000.0 | $ 20,000,000.0 |  |  |  |  |  |  |
Stock Repurchased and Retired During Period, Shares (in shares) |  |  |  |  |  | 0 | 613,000 | 0 |  |  |
Stock Repurchased and Retired During Period, Value |  |  |  |  |  |  | $ 11,497,000 |  |  |  |
Stock Repurchase Program, Remaining Authorized Repurchase Amount |  |  |  |  |  | $ 28,700,000 |  |  |  |  |
Dividends Payable, Amount Per Share (in dollars per share) |  |  |  |  |  | $ 0.28 |  |  | $ 0.28 | $ 0.27 |
Preferred Stock, Par or Stated Value Per Share (in dollars per share) |  |  |  |  | $ 1 | $ 0.001 | $ 0.001 |  |  |  |
Convertible Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |
Preferred Stock, Shares Outstanding, Ending Balance (in shares) |  |  |  |  |  | 250,000 | 2,500 |  |  |  |

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