Quarterly report pursuant to Section 13 or 15(d)

Activity Related to Notes (Detail 1)

v3.19.3.a.u2
Activity Related to Notes (Detail 1) - USD ($)
 6 Months Ended
Nov. 30, 2019
Nov. 30, 2018
Debt Instrument [Line Items]    
Monthly redemption provision $ 0  
Note amendment, net 111,410  
Redemptions (850,000)
Interest accretion 985,907  
August 31, 2019 Note 2,962,317  
Short-term Debt [Member]    
Debt Instrument [Line Items]    
Monthly redemption provision 2,100,000  
Note amendment, net 0  
Redemptions (1,726,582)  
Interest accretion 300,308  
August 31, 2019 Note 2,773,726  
Long-term Debt [Member]    
Debt Instrument [Line Items]    
Monthly redemption provision (2,100,000)  
Note amendment, net 111,410  
Redemptions (2,108,418)  
Interest accretion 685,599  
August 31, 2019 Note 188,591  
Two Thousand And Eighteen Convertible Notes [Member]    
Debt Instrument [Line Items]    
June 2018 Note 5,700,000  
Two Thousand And Eighteen Convertible Notes [Member] | Short-term Debt [Member]    
Debt Instrument [Line Items]    
June 2018 Note 2,100,000  
Two Thousand And Eighteen Convertible Notes [Member] | Long-term Debt [Member]    
Debt Instrument [Line Items]    
June 2018 Note $ 3,600,000