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Stock Based Compensation (Tables)
9 Months Ended
Nov. 30, 2018
Notes to Financial Statements  
Weighted-average Black-Scholes assumptions
   Nine Months Ended November 30, 
   2018   2017 
Expected life   8 years    2-8 years 
Risk free interest rate   2.68% - 2.98%    1.79% - 2.01% 
Expected volatility   24.82% - 28.24%    12.65% - 18.06% 
Expected dividend yield   0%    0%