Note 7 - Stock-based Compensation (Details Textual) - USD ($) |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
Sep. 30, 2018 |
Sep. 30, 2017 |
Sep. 30, 2018 |
Sep. 30, 2017 |
|
| Allocated Share-based Compensation Expense, Total | $ 93,360 | $ 40,920 | $ 93,360 | $ 40,920 |
| Non-employee Director Stock Options [Member] | ||||
| Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross | 1,000 | 1,000 | 1,000 | 1,000 |