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Note 16 - Income Taxes - Components of Income Tax Provision (Details) - USD ($) | 12 Months Ended
--- | ---
Jul. 31, 2021 | Jul. 31, 2020
Loss before income taxes | $ (14,817,818) | $ (14,616,067)
Corporate tax rate | 21.83% | 21.72%
Expected tax recovery | $ (3,234,730) | $ (3,174,610)
Foreign tax rate differences | 77,454 | 85,796
Permanent differences | (217,615) | 170,023
Prior year true-up | (270,078) | 117,800
Change in state tax rate | (405,826) | (553,365)
Foreign exchange rate differences | (55,666) | 17,456
Other | 162,812 | 71,805
Change in valuation allowance | 3,939,641 | 3,233,427
Tax adjustment from operations | (4,008) | (31,668)
Unrealized loss, other comprehensive loss |  | 26,117
Deferred tax benefits | $ (4,008) | $ (5,551)

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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to the prior year tax rate. + References No definition available. + Details
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