Note 13 - Capital Stock (Tables)

12 Months Ended

Jul. 31, 2021

Notes Tables

Schedule of Warrants, Valuation Assumptions [Table Text Block]

Expected Risk Free Interest Rate	0.14	%
Expected Annual Volatility	76.81	%
Expected Contractual Life in Years	2.00
Expected Annual Dividend Yield	0.00	%

Expected Risk Free Interest Rate	0.85	%
Expected Annual Volatility	72.17	%
Expected Contractual Life in Years	5.00
Expected Annual Dividend Yield	0.00	%

Schedule of Net Proceeds Allocation [Table Text Block]

Fair Value of Shares	$	12,000,000
Fair Value of Share Purchase Warrants		1,445,756
Total Fair Value Before Allocation to Net Proceeds	$	13,445,756
Gross Proceeds	$	15,000,000
Share Issuance Costs - Cash		(878,344	)
Net Cash Proceeds Received	$	14,121,656
Relative Fair Value Allocation to:
Shares	$	12,603,224
Share Purchase Warrants		1,518,432
	$	14,121,656

Schedule Of Share based Compensation Warrants Activity [Table Text Block]

	Number of Warrants			Weighted Average Exercise Price
Balance, July 31, 2019		19,443,910		$	1.94
Issued		300,000			1.38
Expired		(12,021,929	)		1.87
Balance, July 31, 2020		7,721,981			2.03
Issued in connection with September 2020 Offering		6,833,333			1.80
Issued in connection with April 2021 Offering		181,818			4.13
Exercised		(8,240,505	)		1.99
Expired		(1,109,304	)		1.87
Balance, July 31, 2021		5,387,323		$	1.90

Schedule of Stockholders' Equity Note, Warrants or Rights [Table Text Block]

Weighted Average Exercise Price		Number of Warrants Outstanding		Weighted Average Remaining Contractual Life (Years)		Expiry Date
$	2.30		271,546		1.02	August 9, 2022
	1.64		25,000		1.80	May 21, 2023
	1.80		4,908,959		1.15	September 23, 2022
	4.13		181,818		4.68	April 5, 2026
$	1.90		5,387,323		1.26