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Note 3 - Equity Compensation Plans and Capital Stock (Details Textual) - USD ($) $ / shares in Units, $ in Thousands |  | 12 Months Ended |
--- | --- | --- | ---
Dec. 13, 2023 | Mar. 31, 2024 | Mar. 31, 2023 | Sep. 01, 2016
Treasury Stock, Shares, Acquired (in shares) |  | 0 | 0 |
Treasury Stock, Value, Acquired, Cost Method |  | $ 5,151 | $ 37 |
Share Repurchase Program, Authorized, Number of Shares (in shares) | 1,045,774 |  |  |
Restricted Stock, Shares Issued Net of Shares for Tax Withholdings (in shares) |  | 3,723 | 4,162 |
Metal One Corporation [Member] |  |  |  |
Treasury Stock, Shares, Acquired (in shares) | 400,041 |  |  |
Treasury Stock, Value, Acquired, Cost Method | $ 5,100 |  |  |
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 (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 Units (RSUs) [Member] |  |  |  |
Share-Based Payment Arrangement, Expense |  | $ 200 | $ 300 |
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount |  | $ 100 | $ 300 |
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year) |  | 9 months 18 days | 1 year 4 months 24 days |
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant (in shares) |  | 117,998 |  |

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