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Note 11 - Information As to Employee Stock Purchase, Savings, and Similar Plans (Details Textual) - USD ($)
3 Months Ended 12 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Mar. 31, 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 $ 24,066 $ 23,298