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EARNINGS PER SHARE (Details) - USD ($)
 3 Months Ended 6 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Basic EPS        
Net income (loss) $ (220,413) $ 270,764 $ 1,150,679 $ 154,530
Weighted average shares 31,359,941 29,431,629 30,424,216 29,395,791
Net income (loss) per share $ (0.01) $ 0.01 $ 0.04 $ 0.01
Diluted EPS        
Net income (loss) $ (220,413) $ 270,764 $ 1,150,679 $ 154,530
Dilutive effect of stock options   1,555,604 1,602,046 1,606,339
Weighted average shares 31,359,941 30,987,233 32,026,262 31,002,130
Net income (loss) per share $ (0.01) $ 0.01 $ 0.04 $ 0.01
Antidilutive securities excluded from computation of earnings per share amount (in shares) 1,660,922