4. Costs and Estimated Earnings on Uncompleted Contracts: Schedule of Costs incurred on uncompleted contracts and Estimated earnings (Details) - USD ($) |
12 Months Ended | |
|---|---|---|
May 31, 2026 |
May 31, 2025 |
|
| Details | ||
| Costs incurred on uncompleted contracts | $ 9,111,805 | $ 12,499,313 |
| Costs incurred on uncompleted contracts, Estimated earnings | 11,539,013 | 13,175,240 |
| Costs incurred on uncompleted contracts, Gross | 20,650,818 | 25,674,553 |
| Costs incurred on uncompleted contracts, Billings to date | 13,985,655 | 24,696,121 |
| Costs incurred on uncompleted contracts, Net | $ 6,665,163 | $ 978,432 |