Note 11 - Information as to Employee Stock Purchase, Savings, and Similar Plans (Details Textual) - USD ($) |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
Sep. 30, 2020 |
Sep. 30, 2019 |
Sep. 30, 2020 |
Sep. 30, 2019 |
|
| Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay | 100.00% | |||
| Defined Contribution Plan, Maximum Annual Contributions Per Employee, Percent | 3.00% | |||
| Defined Benefit Plan, Plan Assets, Contributions by Employer | $ 21,275 | $ 21,990 | $ 46,656 | $ 46,056 |