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Summary of Activity of Stock Options (Details) - USD ($)
6 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Number of Shares, Granted 31,000 0
Number of Shares, Exercised (27,900) (1,500)
Number of Shares, Forfeited or Expired 0 0
Share-based Payment Arrangement, Option [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Number of Shares, Beginning Balance 156,000  
Weighted Average Exercise Price Per Share, Beginning Balance $ 5.28  
Weighted Average Remaining Contract Life in Years, Beginning Balance 5 years 6 months 10 days  
Intrinsic Value, Beginning Balance $ 555,100  
Number of Shares, Granted 31,000  
Weighted Average Exercise Price Per Share, Granted $ 8.51  
Number of Shares, Exercised (27,900)  
Weighted Average Exercise Price Per Share, Exercised $ 6.63  
Number of Shares, Forfeited or Expired  
Weighted Average Exercise Price Per Share, Forfeited or Expired  
Number of Shares, Ending Balance 159,100  
Weighted Average Exercise Price Per Share, Ending Balance $ 5.67  
Weighted Average Remaining Contract Life in Years, Ending Balance 6 years 6 months  
Intrinsic Value, Ending Balance $ 752,622  
Number of Shares, Vested 87,350  
Weighted Average Exercise Price Per Share, Vested $ 5.56  
Weighted Aggregate Average Remaining Contract Life in Years, Vested 4 years 7 months 2 days  
Intrinsic Value, Vested $ 422,362  
Number of Shares, Exercisable 87,350  
Weighted Average Exercise Price Per Share, Exercisable $ 5.56  
Weighted Aggregate Average Remaining Contract Life in Years, Exercisable 4 years 7 months 2 days  
Intrinsic Value, Exercisable $ 422,362