Quarterly report pursuant to Section 13 or 15(d)

2. SIGNIFICANT ACCOUNTING POLICIES (Details Narrative)

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2. SIGNIFICANT ACCOUNTING POLICIES (Details Narrative) - USD ($)
3 Months Ended 6 Months Ended
Oct. 31, 2020
Oct. 31, 2019
Oct. 31, 2020
Oct. 31, 2019
Apr. 30, 2020
Intangible assets $ 3,549,427   $ 3,549,427   $ 3,549,427
Impairment of intangible assets     0 $ 0  
Research and development costs 151,314 $ 17,940 421,888 90,270  
Uninsured cash balances 3,439,000   3,439,000   618,000
Accumulated deficit (105,692,395)   (105,692,395)   $ (103,858,259)
Net loss (950,192) $ (1,067,122) (1,834,136) $ (2,201,197)  
Block Trade [Member]          
Proceeds from the sale of equity     4,700,000    
Cell-in-a-Box [Member]          
Intangible assets 1,549,427   1,549,427    
Diabetes License [Member]          
Intangible assets $ 2,000,000   $ 2,000,000    
SG Austria [Member]          
Percentage investment in SG Austria 14.50%   14.50%