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Note 16 - Income Taxes - Deferred Tax Assets (Liabilities) (Details) - USD ($) | Jul. 31, 2021 | Jul. 31, 2020
--- | --- | ---
Mineral properties | $ 1,277,053 | $ 1,270,292
Exploration costs | 6,546,397 | 6,384,265
Stock option expense | 4,623,357 | 4,594,159
Depreciable property | (1,163,533) | (1,157,934)
Inventories | (3,607,772) | (3,550,814)
Asset retirement obligations | 107,499 | 62,626
Other | 80,834 | 58,559
Section 163(j) interest expense carry forwards | 1,061,263 | 733,343
Loss carry forwards | 49,987,843 | 46,552,687
Deferred Tax Assets, Gross, Total | 58,912,941 | 54,947,183
Valuation allowance | (58,912,941) | (54,973,300)
Deferred tax assets |  | (26,117)
Deferred tax assets, other comprehensive loss |  | 26,117
Mineral properties | (540,992) | (545,000)
Net deferred tax liabilities | $ (540,992) | $ (545,000)

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