Note 11 - Information as to Employee Stock Purchase, Savings, and Similar Plans (Details Textual) - USD ($) |
3 Months Ended | |
|---|---|---|
Jun. 30, 2020 |
Jun. 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 | $ 25,381 | $ 24,066 |