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Stock Based Compensation (Details 5)
12 Months Ended
May 31, 2020
USD ($)
$ / shares
shares
Share-based Payment Arrangement [Abstract]  
Non-vested restricted stock units outstanding, beginning | shares 98,000
Restricted stock units granted | shares 87,478
Restricted stock units vested | shares (113,561)
Restricted stock units forfeited | shares (16,770)
Non-vested restricted stock units outstanding, ending | shares 55,147
Weighted average exercise price, beginning | $ / shares $ 2.94
Weighted average exercise price granted | $ / shares 2.99
Weighted average exercise price vested | $ / shares 2.83
Weighted average exercise price forfeited | $ / shares 2.79
Weighted average exercise price, ending | $ / shares $ 3.28
Aggregate intrinsic value, beginning | $ $ 288,120
Aggregate intrinsic value granted | $ 261,559
Aggregate intrinsic value vested | $ (321,378)
Aggregate intrinsic value forfeited | $ (46,788)
Aggregate intrinsic value, ending | $ $ 180,882