Note 13 - Income Taxes - Significant Components of Deferred Tax Assets and Liabilities (Details) - USD ($) |
Mar. 31, 2022 |
Mar. 31, 2021 |
|---|---|---|
| Net operating loss carry-forward | $ 834,000 | $ 644,000 |
| Research & development tax credit carry-forward | 426,000 | 355,000 |
| Allowance for doubtful accounts | 190,000 | 84,000 |
| Valuation allowance | (1,323,000) | 0 |
| Other | (2,000) | (2,000) |
| Deferred tax asset, net | $ 125,000 | $ 1,081,000 |