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Note 16 - Income Taxes (Tables)

12 Months Ended

Jul. 31, 2021

Notes Tables

Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]

		Year Ended July 31,
		2021				2020
Federal income tax provision rate			21.00	%			21.00	%
State income tax provision rate, net of federal income tax effect			0.83	%			0.72	%
Total income tax provision rate			21.83	%			21.72	%

Schedule of Components of Income Tax Expense (Benefit) [Table Text Block]

		Year Ended July 31,
		2021				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	)
Increase (decrease) resulting from
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	)

Schedule of Income before Income Tax, Domestic and Foreign [Table Text Block]

		Year Ended July 31,
		2021				2020
United States		$	(14,297,315	)		$	(13,962,287	)
Canada			93,402				53,960
Paraguay			(613,905	)			(707,740	)
		$	(14,817,818	)		$	(14,616,067	)

Schedule of Deferred Tax Assets and Liabilities [Table Text Block]

		July 31, 2021				July 31, 2020
Deferred tax assets (liabilities)
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
			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
Deferred tax liabilities
Mineral properties			(540,992	)			(545,000	)
Net deferred tax liabilities		$	(540,992	)		$	(545,000	)

Summary of Operating Loss Carryforwards [Table Text Block]

July 31, 2023		$	180,892
July 31, 2024			228,757
July 31, 2025			507,833
July 31, 2026			5,895,221
July 31, 2027			3,892,722
Remaining balance			162,246,385
		$	172,951,810

July 31, 2027		$	183,105
July 31, 2028			629,788
July 31, 2029			769,072
July 31, 2030			764,230
July 31, 2031			1,570,266
Remaining balance			969,872
		$	4,886,333

X

- Definition

Tabular disclosure of the components of income tax expense attributable to continuing operations for each year presented including, but not limited to: current tax expense (benefit), deferred tax expense (benefit), investment tax credits, government grants, the benefits of operating loss carryforwards, tax expense that results from allocating certain tax benefits either directly to contributed capital or to reduce goodwill or other noncurrent intangible assets of an acquired entity, adjustments of a deferred tax liability or asset for enacted changes in tax laws or rates or a change in the tax status of the entity, and adjustments of the beginning-of-the-year balances of a valuation allowance because of a change in circumstances that causes a change in judgment about the realizability of the related deferred tax asset in future years.

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