Note 3 - Inventories - Summary of Inventory (Details) - USD ($) |
Dec. 31, 2025 |
Mar. 31, 2025 |
|---|---|---|
| Raw materials | $ 464,840 | $ 488,268 |
| Finished goods | 68,633 | 68,403 |
| Totals | 533,473 | 556,671 |
| Current [Member] | ||
| Raw materials | 283,597 | 279,223 |
| Finished goods | 57,836 | 57,047 |
| Totals | 341,433 | 336,270 |
| Long Term [Member | ||
| Raw materials | 181,243 | 209,045 |
| Finished goods | 10,797 | 11,356 |
| Totals | $ 192,040 | $ 220,401 |