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Note 12 - Fair Value of Financial Instruments (Tables) | 12 Months Ended
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Mar. 31, 2022
Notes Tables |
Fair Value, by Balance Sheet Grouping [Table Text Block] |
|  | As of: |
|  | March 31, |  |  | March 31, |
|  | 2022 |  |  | 2021 |
|  | Carrying |  |  | Estimated |  |  | Carrying |  |  | Estimated |
|  | Amount |  |  | Fair Value |  |  | Amount |  |  | Fair Value |
Long-term debt, including current portion |  | $ | 113,624 |  |  | $ | 108,608 |  |  | $ | 98,585 |  |  | $ | 97,226 |

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