Quarterly report pursuant to Section 13 or 15(d)

3. SIGNIFICANT ACCOUNTING POLICIES (Details Narrative)

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3. SIGNIFICANT ACCOUNTING POLICIES (Details Narrative) - USD ($)
3 Months Ended 6 Months Ended
Oct. 31, 2017
Oct. 31, 2016
Oct. 31, 2017
Oct. 31, 2016
Apr. 30, 2017
Property, Plant and Equipment [Line Items]          
Intangible assets $ 3,549,427   $ 3,549,427   $ 3,549,427
Impairment of intangible assets     0    
Impairment of long-lived assets     0    
Research and development upfront payment         $ 2,000,000
Research and development costs 515,458 $ 253,768 943,128 $ 428,772  
Uninsured cash balances $ 2,432,000 $ 1,302,000 $ 2,432,000 $ 1,302,000  
SG Austria [Member]          
Property, Plant and Equipment [Line Items]          
Percentage investment in SG Austria 14.50%   14.50%    
Cell-in-a-Box [Member]          
Property, Plant and Equipment [Line Items]          
Intangible assets $ 1,549,427   $ 1,549,427    
Diabetes License [Member]          
Property, Plant and Equipment [Line Items]          
Intangible assets $ 2,000,000   $ 2,000,000