4. Costs and Estimated Earnings on Uncompleted Contracts: Schedule of Amounts are included in the accompanying balance sheets (Details) - USD ($) |
12 Months Ended | |
|---|---|---|
May 31, 2025 |
May 31, 2024 |
|
| Details | ||
| Costs and estimated earnings in excess of billings | $ 5,360,499 | $ 4,356,565 |
| Billings in excess of costs and estimated earnings | 4,382,067 | 5,601,274 |
| Costs incurred on uncompleted contracts, Net | $ 978,432 | $ (1,244,709) |