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Stock Based Compensation (Tables)
12 Months Ended
Feb. 28, 2019
Notes to Financial Statements  
Weighted-average Black-Scholes assumptions
   Fiscal Year Ended February 28, 
   2019   2018 
Expected life  8 years   2-8 years 
Risk free interest rate   2.47% - 2.98%    1.79% - 2.32% 
Expected volatility   24.82% - 28.24%    12.65% - 22.24% 
Expected dividend yield   0%    0%