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Note 3 - Revenue Recognition - Revenues by Major Customers (Details) - Revenue Benchmark [Member] - Customer Concentration Risk [Member] | 3 Months Ended
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Jun. 30, 2025 | Jun. 30, 2024
Grid [Member] | Fuji Bridex Pte Ltd [Member] |  |
Concentration percentage | 21.00% | 10.00%
Wind [Member] | Inox Wind Limited [Member] |  |
Concentration percentage | 16.00% | 18.00%

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