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Stock Options And Stock-Based Compensation (Details 2)
3 Months Ended
Aug. 31, 2020
USD ($)
$ / shares
shares
Share-based Payment Arrangement [Abstract]  
Non-vested restricted stock units outstanding, beginning | shares 55,147
Restricted stock units granted | shares 25,922
Restricted stock units vested | shares (40,031)
Non-vested restricted stock units outstanding, ending | shares 41,038
Weighted average exercise price, beginning | $ / shares $ 3.28
Weighted average exercise price granted | $ / shares 3.71
Weighted average exercise price vested | $ / shares 3.26
Weighted average exercise price, ending | $ / shares $ 3.57
Aggregate intrinsic value, beginning | $ $ 180,882
Aggregate intrinsic value granted | $ 96,234
Aggregate intrinsic value vested | $ (130,572)
Aggregate intrinsic value, ending | $ $ 146,544