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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

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- Definition Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121826272&loc=d3e32559-109319 + Details
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