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Note 3 - Revenue Recognition - Revenues by Major Customers (Details) - Revenue Benchmark [Member] - Customer Concentration Risk [Member] | 3 Months Ended | 9 Months Ended
--- | --- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2021 | Dec. 31, 2020
Inox Wind Limited [Member] | Wind [Member] |  |  |  |
Concentration risk percentage |  | 24.00% |  | 12.00%
Fuji Bridex Pte Ltd [Member] | Grid [Member] |  |  |  |
Concentration risk percentage | 20.00% |  | 10.00% |
EPC Services Company [Member] | Grid [Member] |  |  |  |
Concentration risk percentage |  | 14.00% |  | 17.00%

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