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Stock Options And Stock-Based Compensation (Details 2)
9 Months Ended
Feb. 28, 2021
USD ($)
$ / shares
shares
Share-based Payment Arrangement [Abstract]  
Non-vested restricted stock units outstanding, beginning | shares 55,147
Restricted stock units granted | shares 62,881
Restricted stock units vested | shares (83,072)
Non-vested restricted stock units outstanding, ending | shares 34,956
Weighted average exercise price, beginning | $ / shares $ 3.28
Weighted average exercise price granted | $ / shares 4.62
Weighted average exercise price vested | $ / shares 3.78
Weighted average exercise price, ending | $ / shares $ 4.50
Aggregate intrinsic value, beginning | $ $ 180,882
Aggregate intrinsic value granted | $ 290,529
Aggregate intrinsic value vested | $ (313,976)
Aggregate intrinsic value, ending | $ $ 157,435