v3.26.3
Note 3 - Revenue Recognition - Revenues by Major Customers (Details) - Revenue Benchmark [Member] - Customer Concentration Risk [Member]
3 Months Ended 6 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Sep. 30, 2026
Sep. 30, 2025
Inox Wind Limited [Member] | Wind [Member]        
Concentration percentage 18.00% 16.00% 18.00% 16.00%
Anovion LLC [Member] | Grid [Member]        
Concentration percentage 0.00% 12.00% 0.00% 10.00%
Fuji Bridex Pte Ltd [Member] | Grid [Member] | Maximum [Member]        
Concentration percentage 10.00% 10.00% 10.00% 13.00%