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Stockholders' Equity - Summary of stock options (Details) - $ / shares
 12 Months Ended
Feb. 29, 2020
Feb. 28, 2019
Shares    
Outstanding at beginning of period (in shares) 588,000 912,100
Exercisable at beginning of period (in shares) 171,000 425,400
Granted (in shares) 237,500 55,000
Exercised (in shares) (231,333) (371,100)
Cancelled (in shares) (2,500) (8,000)
Outstanding at end of period (in shares) 591,667 588,000
Exercisable at end of period (in shares) 339,250 171,000
Weighted Average Exercise Price    
Outstanding at beginning of period (in dollars per share) $ 1.10 $ 0.96
Granted (in dollars per share) 2.55 2.66
Exercised (in dollars per share) (0.88) (0.96)
Cancelled (in dollars per share) (1.17) (1.12)
Outstanding at end of period (in dollars per share) 1.77 1.10
Exercisable at beginning of period (in dollars per share) 0.85 0.92
Exercisable at end of period (in dollars per share) 2.03 0.85
Fair value vested at beginning of period (in dollars per share) 0.34 0.35
Fair value vested at end of period (in dollars per share) $ 0.35 $ 0.34