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Note 11 - Capital Stock - Net Proceeds Allocation (Details) - USD ($)
3 Months Ended 6 Months Ended
Oct. 03, 2018
Oct. 31, 2018
Jan. 31, 2019
Shares     $ 15,990,962
Common Stock [Member]      
Shares     $ 12,613
The 2018 October Offering [Member]      
Fair Value of Shares $ 22,518,788    
Proceeds from Issuance or Sale of Equity, Total 20,180,878    
Share Issuance Costs - Cash (1,211,667)    
Net Cash Proceeds Received 18,969,211    
Shares   $ 20,180,878  
18,969,211    
The 2018 October Offering [Member] | October 2018 Warrants [Member]      
Fair Value of Shares 3,094,693    
Share Purchase Warrants 2,606,884    
The 2018 October Offering [Member] | Common Stock [Member]      
Fair Value of Shares 19,424,095    
Shares $ 16,362,327