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Stock Based Compensation (Tables)
6 Months Ended
Aug. 31, 2019
Notes to Financial Statements  
Weighted-average Black-Scholes assumptions
  Six Months Ended
August 31, 2019
Expected Life 1-8 years
Risk free interest rate 1.58% - 2.05%
Expected volatility 27.46% - 29.05%
Expected dividend yield 0%