Note 11 - Information As to Employee Stock Purchase, Savings, and Similar Plans (Details Textual) - USD ($) |
12 Months Ended | ||
|---|---|---|---|
Mar. 31, 2018 |
Mar. 31, 2017 |
Mar. 31, 2016 |
|
| 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 | $ 100,904 | $ 104,643 | $ 94,831 |