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Earnings Per Share (Tables)
6 Months Ended
Aug. 31, 2018
Earnings Per Share - Denominator For Calculation Of Diluted Earnings Per Share  
Computation of basic and diluted earnings per share
   Six Months Ended   Three Months Ended 
   August 31,   August 31, 
   2018   2017   2018   2017 
Numerator for basic and diluted earnings per share  $80,554   $70,514   $59,124   $54,645 
                     
Denominator for basic earnings per share – weighted average   15,036,644    14,961,137    15,085,660    14,961,197 
                     
Effects of dilutive securities                    
                     
Stock options for employees, directors and outside consultants   132,566    98,889    138,561    103,434 
                     
Denominator for diluted earnings per share   15,169,211    15,060,026    15,224,222    15,064,631 
                     
Basic earnings per share  $0.01   $0.00   $0.00   $0.00 
Diluted earnings per share  $0.01   $0.00   $0.00   $0.00