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Earnings Per Share - Computation of basic and diluted earnings per share (Details) - USD ($)
3 Months Ended 6 Months Ended
Aug. 31, 2021
Aug. 31, 2020
Aug. 31, 2021
Aug. 31, 2020
Earnings Per Share [Abstract]        
Numerator for basic and diluted earnings per share $ 343,824 $ 177,763 $ 1,610,576 $ 345,691
Denominator for basic earnings per share – weighted average 15,507,484 15,424,126 15,500,952 15,410,952
Effects of dilutive securities        
Stock options for employees, directors and outside consultants 94,875 108,884 112,978 119,958
Denominator for diluted earnings per share 15,602,359 15,533,010 15,613,930 15,530,910
Basic Earnings Per Share $ 0.02 $ 0.01 $ 0.10 $ 0.02
Diluted Earnings Per Share $ 0.02 $ 0.01 $ 0.10 $ 0.02