Annual report pursuant to Section 13 and 15(d)

2. SIGNIFICANT ACCOUNTING POLICIES (Details Narrative)

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2. SIGNIFICANT ACCOUNTING POLICIES (Details Narrative) - USD ($)
12 Months Ended
Apr. 30, 2019
Apr. 30, 2018
Property, Plant and Equipment [Line Items]    
Intangible assets $ 3,549,427 $ 3,549,427
Impairment of intangible assets 0 0
Research and development costs 460,052 1,997,811
Uninsured cash balances 127,000 772,000
Accumulated deficit (100,031,371) (95,964,143)
Net loss (4,067,228) $ (6,828,841)
Cell-in-a-Box [Member]    
Property, Plant and Equipment [Line Items]    
Intangible assets 1,549,427  
Diabetes License [Member]    
Property, Plant and Equipment [Line Items]    
Intangible assets $ 2,000,000  
SG Austria [Member]    
Property, Plant and Equipment [Line Items]    
Percentage investment in SG Austria 14.50%  
Research and development upfront payment $ 2,000,000