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Note 11 - Information As to Employee Stock Purchase, Savings, and Similar Plans (Details Textual) - USD ($)
3 Months Ended
Jun. 30, 2022
Jun. 30, 2021
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 $ 28,426 $ 28,584