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Note 16 - Income Taxes - Net Operating Loss Carry-forwards Expirations (Details) - Jul. 31, 2021 | USD ($) | CAD ($)
--- | --- | ---
Domestic Tax Authority [Member] | Internal Revenue Service (IRS) [Member] |  |
Net Operating Loss Carry-forwards Subject to Expiration | $ 172,951,810 |
Foreign Tax Authority [Member] | Canada Revenue Agency [Member] |  |
Net Operating Loss Carry-forwards Subject to Expiration |  | $ 4,886,333
Tax Year 2023 [Member] | Domestic Tax Authority [Member] | Internal Revenue Service (IRS) [Member] |  |
Net Operating Loss Carry-forwards Subject to Expiration | 180,892 |
Tax Year 2027 [Member] | Domestic Tax Authority [Member] | Internal Revenue Service (IRS) [Member] |  |
Net Operating Loss Carry-forwards Subject to Expiration | 3,892,722 |
Tax Year 2027 [Member] | Foreign Tax Authority [Member] | Canada Revenue Agency [Member] |  |
Net Operating Loss Carry-forwards Subject to Expiration |  | 183,105
Tax Year 2024 [Member] | Domestic Tax Authority [Member] | Internal Revenue Service (IRS) [Member] |  |
Net Operating Loss Carry-forwards Subject to Expiration | 228,757 |
Tax Year 2028 [Member] | Foreign Tax Authority [Member] | Canada Revenue Agency [Member] |  |
Net Operating Loss Carry-forwards Subject to Expiration |  | 629,788
Tax Year 2025 [Member] | Domestic Tax Authority [Member] | Internal Revenue Service (IRS) [Member] |  |
Net Operating Loss Carry-forwards Subject to Expiration | 507,833 |
Tax Year 2029 [Member] | Foreign Tax Authority [Member] | Canada Revenue Agency [Member] |  |
Net Operating Loss Carry-forwards Subject to Expiration |  | 769,072
Tax Year 2026 [Member] | Domestic Tax Authority [Member] | Internal Revenue Service (IRS) [Member] |  |
Net Operating Loss Carry-forwards Subject to Expiration | 5,895,221 |
Tax Year 2030 [Member] | Foreign Tax Authority [Member] | Canada Revenue Agency [Member] |  |
Net Operating Loss Carry-forwards Subject to Expiration |  | 764,230
Tax Year 2031 [Member] | Foreign Tax Authority [Member] | Canada Revenue Agency [Member] |  |
Net Operating Loss Carry-forwards Subject to Expiration |  | 1,570,266
Remaining [Member] | Domestic Tax Authority [Member] | Internal Revenue Service (IRS) [Member] |  |
Net Operating Loss Carry-forwards Subject to Expiration | $ 162,246,385 |
Remaining [Member] | Foreign Tax Authority [Member] | Canada Revenue Agency [Member] |  |
Net Operating Loss Carry-forwards Subject to Expiration |  | $ 969,872

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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible operating loss carryforwards that are subject to expiration dates. + References No definition available. + Details
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