Note 7 - Line of Credit (Details Textual) - Revolving Credit Facility [Member] - USD ($) |
Mar. 31, 2022 |
Mar. 31, 2021 |
Jun. 15, 2018 |
|---|---|---|---|
| Line of Credit Facility, Maximum Borrowing Capacity | $ 400,000 | ||
| Debt Instrument, Interest Rate, Stated Percentage | 5.37% | 3.87% | |
| Short-Term Debt, Total | $ 334,760 | $ 226,413 |