Note 3 - Inventories - Summary of Inventory (Details) - USD ($) |
Mar. 31, 2022 |
Mar. 31, 2021 |
|---|---|---|
| Raw materials | $ 421,579 | $ 342,207 |
| Finished goods | 50,227 | 96,661 |
| Totals | 471,806 | 438,868 |
| Current [Member] | ||
| Raw materials | 240,163 | 139,361 |
| Finished goods | 47,913 | 87,873 |
| Totals | 288,076 | 227,234 |
| Long Term [Member | ||
| Raw materials | 181,416 | 202,846 |
| Finished goods | 2,314 | 8,788 |
| Totals | $ 183,730 | $ 211,634 |