Annual report pursuant to Section 13 and 15(d)

Activity Related to Notes (Detail 1)

v3.20.2
Activity Related to Notes (Detail 1) - USD ($)
 12 Months Ended
May 31, 2020
May 31, 2019
Debt Instrument [Line Items]    
Convertible note redemptions paid in cash $ (1,725,000)  
January 2019 Note 0  
Short-term Debt [Member]    
Debt Instrument [Line Items]    
January 2019 Note 0  
Long-term Debt [Member]    
Debt Instrument [Line Items]    
January 2019 Note 0  
Two Thousand And Eighteen Convertible Notes [Member]    
Debt Instrument [Line Items]    
June 2018 Note   $ 5,700,000
Monthly redemption provision   0
Note amendment, net   111,410
Convertible note redemptions paid in cash   (145,500)
January 2019 Note    
Interest accretion   298,158
Two Thousand And Eighteen Convertible Notes [Member] | Short-term Debt [Member]    
Debt Instrument [Line Items]    
June 2018 Note   2,100,000
Monthly redemption provision   2,100,000
Note amendment, net   0
Convertible note redemptions paid in cash   0
January 2019 Note    
Interest accretion   0
Two Thousand And Eighteen Convertible Notes [Member] | Long-term Debt [Member]    
Debt Instrument [Line Items]    
June 2018 Note   3,600,000
Monthly redemption provision   (2,100,000)
Note amendment, net   111,410
Convertible note redemptions paid in cash   (145,500)
January 2019 Note    
Interest accretion   $ 298,158
Two Thousand And Nineteen Convertible Notes [Member]    
Debt Instrument [Line Items]    
Convertible note redemptions paid in cash (10,745,237)  
January 2019 Note 4,654,568  
Interest accretion 6,527,478  
Extinguishment of note (436,809)  
Two Thousand And Nineteen Convertible Notes [Member] | Short-term Debt [Member]    
Debt Instrument [Line Items]    
Convertible note redemptions paid in cash (10,688,640)  
January 2019 Note 420,000  
Interest accretion 6,488,640  
Extinguishment of note 0  
Two Thousand And Nineteen Convertible Notes [Member] | Long-term Debt [Member]    
Debt Instrument [Line Items]    
Convertible note redemptions paid in cash (56,597)  
January 2019 Note 454,568  
Interest accretion 38,838  
Extinguishment of note $ (436,809)