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Note 16 - Income Taxes - Components of Income (Loss) from Operations Before Income Taxes, by Tax Jurisdiction (Details) - USD ($)
12 Months Ended
Jul. 31, 2021
Jul. 31, 2020
Income (loss) from operations before income taxes $ (14,817,818) $ (14,616,067)
Domestic Tax Authority [Member] | Internal Revenue Service (IRS) [Member]    
Income (loss) from operations before income taxes (14,297,315) (13,962,287)
Foreign Tax Authority [Member] | Canada Revenue Agency [Member]    
Income (loss) from operations before income taxes 93,402 53,960
Foreign Tax Authority [Member] | Tax Administration of Paraguay [Member]    
Income (loss) from operations before income taxes $ (613,905) $ (707,740)