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Note 16 - Income Taxes (Details Textual)
$ in Millions
12 Months Ended
Jul. 31, 2021
USD ($)
Jul. 31, 2020
USD ($)
Jul. 31, 2021
CAD ($)
Interest Expense Carryforward $ 4,900,000    
Current Tax Expense (Benefit) 0    
Deferred Tax Expense (Benefit) $ (4,008) $ (5,551)  
Percentage of Valuation Allowance Recorded from Income Taxes 100.00%    
UNITED STATES      
Operating Loss Carryforwards With Indefinite Life $ 51,300,000    
Domestic Tax Authority [Member] | Internal Revenue Service (IRS) [Member]      
Operating Loss Carryforwards, Total $ 173,000,000   $ 4.9