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Note 2 - Revenue Recognition - Revenues by Major Customers (Details) - Revenue Benchmark [Member] - Customer Concentration Risk [Member] | 3 Months Ended | 6 Months Ended
--- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Inox Wind Limited [Member] | Wind [Member] |  |  |  |
Concentration of risk, revenue | 12.00% |  | 12.00% |
Fuji Bridex Pte Ltd [Member] | Grid [Member] |  |  |  |
Concentration of risk, revenue |  | 17.00% |  | 13.00%
Gray Construction, Inc. [Member] | Grid [Member] |  |  |  |
Concentration of risk, revenue | 11.00% |  |  |
Ascend Performance Materials Ops LLC [Member] | Grid [Member] |  |  |  |
Concentration of risk, revenue |  | 12.00% |  |

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