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Schedule of Reconciliation of Basic and Diluted Net Income (loss) Per Share (Details) - USD ($)
 3 Months Ended 6 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Income (loss) per common share:        
Net income (loss) $ 708,828 $ (41,970) $ 1,103,834 $ (341,640)
Shares outstanding: Weighted avg. common shares outstanding - basic 2,091,417 2,040,941 2,084,127 2,040,553
Shares outstanding: Effect of the assumed exercise of dilutive stock options $ 52,326 $ 47,762
Shares outstanding: Weighted avg. common shares outstanding - dilutive 2,143,743 2,040,941 2,131,889 2,040,553
Income (loss) per common share: Basic $ 0.34 $ (0.02) $ 0.53 $ (0.17)
Income (loss) per common share: Diluted $ 0.33 $ (0.02) $ 0.52 $ (0.17)