Note 11 - Segment Information - Summary of Segment Information (Details) - USD ($) |
12 Months Ended | |
|---|---|---|
Mar. 31, 2022 |
Mar. 31, 2021 |
|
| Revenue from Contract with Customer, Including Assessed Tax | $ 3,206,594 | $ 3,090,631 |
| Segment operating (loss) | (1,129,314) | (680,478) |
| Total assets | 3,250,897 | 5,214,099 |
| Chemical [Member] | ||
| Revenue from Contract with Customer, Including Assessed Tax | 1,319,578 | 1,244,361 |
| Segment operating (loss) | (443,587) | (263,061) |
| Total assets | 1,332,867 | 2,033,499 |
| Electronics [Member] | ||
| Revenue from Contract with Customer, Including Assessed Tax | 1,405,594 | 1,328,719 |
| Segment operating (loss) | (662,808) | (457,372) |
| Total assets | 1,430,395 | 2,294,203 |
| Engineering [Member] | ||
| Revenue from Contract with Customer, Including Assessed Tax | 481,422 | 517,551 |
| Segment operating (loss) | (22,919) | 39,955 |
| Total assets | $ 487,635 | $ 886,397 |