Annual report pursuant to Section 13 and 15(d)

Equity Awards and Warrants - Activity (Detail)

v3.21.2
Equity Awards and Warrants - Activity (Detail) - USD ($)
 12 Months Ended
May 31, 2021
May 31, 2020
May 31, 2019
Stock option and warrant activity      
Options and warrants outstanding, Number of Shares 131,360 178,592  
Granted, Number of Shares 7,036 57,720  
Exercised, Number of Shares (75,735) (101,853)  
Forfeited/expired/cancelled, Number of Shares (1,088) (3,099)  
Options and warrants outstanding, Number of Shares 61,573 131,360 178,592
Outstanding exercisable, Number of Shares 55,713    
Options and warrants outstanding, Weighted Average Exercise Price $ 0.65 $ 0.71  
Granted, Weighted Average Exercise Price 3.82 0.47  
Exercised, Weighted Average Exercise Price 0.59 0.56  
Forfeited/expired/cancelled, Weighted Average Exercise Price 1.66 0.74  
Options and warrants outstanding, Weighted Average Exercise Price 0.95 $ 0.65 $ 0.71
Outstanding exercisable, Weighted Average Exercise Price $ 0.78    
Options and warrants outstanding, Weighted Average Remaining Contractual Life in Years 4 years 4 months 24 days 5 years 9 months 14 days 3 years 7 months 28 days
Outstanding exercisable, Weighted Average Remaining Contractual Life in Years 3 years 11 months 23 days    
Options and warrants outstanding, Aggregate Intrinsic Value $ 68,756 $ 302,961 $ 896
Outstanding exercisable, Aggregate Intrinsic Value $ 67,151