Note 12 - Capital Stock (Tables)

12 Months Ended

Jul. 31, 2019

Notes Tables

Schedule of Warrants, Valuation Assumptions [Table Text Block]

Expected Risk Free Interest Rate	2.90	%
Expected Annual Volatility	63.30	%
Expected Contractual Life in Years	2.50
Expected Annual Dividend Yield	0.00	%

Expected Risk Free Interest Rate	1.50	%
Expected Annual Volatility	76.96	%
Expected Contractual Life in Years	3.00
Expected Annual Dividend Yield	0.00	%

Schedule of Net Proceeds Allocation [Table Text Block]

Fair Value of Shares	$	19,424,095
Fair Value of Share Purchase Warrants		3,094,693
Total Fair Value Before Allocation to Net Proceeds	$	22,518,788
Gross Proceeds	$	20,180,878
Share Issuance Costs - Cash		(1,211,667	)
Net Cash Proceeds Received	$	18,969,211
Relative Fair Value Allocation to:
Shares	$	16,362,327
Share Purchase Warrants		2,606,884
	$	18,969,211

Fair Value of Shares	$	26,689,487
Fair Value of Share Purchase Warrants		5,873,932
Total Fair Value Before Allocation to Net Proceeds	$	32,563,419
Gross Proceeds	$	25,996,254
Share Issuance Costs - Cash		(1,550,843	)
Net Cash Proceeds Received	$	24,445,411
Relative Fair Value Allocation to:
Shares	$	20,035,841
Share Purchase Warrants		4,409,570
	$	24,445,411

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

	Number of Warrants			Weighted Average Exercise Price
Balance, July 31, 2016		13,953,872		$	1.65
Issued		9,571,929			2.00
Exercised		(1,989,717	)		1.20
Expired		(1,859,524	)		2.60
Balance, July 31, 2017		19,676,560			1.78
Issued		11,358,728			2.30
Exercised		(61,799	)		1.20
Expired		(50,000	)		1.95
Balance, July 31, 2018		30,923,489			1.97
Issued		7,063,253			2.05
Exercised		(3,999,881	)		1.21
Expired		(3,542,951	)		2.13
Exchanged for shares pursuant to Securities Exchange Agreement		(11,000,000	)		2.30
Balance, July 31, 2019		19,443,910		$	1.94

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
$	2.00		9,571,929		0.47	January 20, 2020
	1.35		2,450,000		0.50	January 30, 2020
	2.05		7,063,253		1.68	April 3, 2021
	2.30		308,728		3.03	August 9, 2022
	1.64		50,000		3.81	May 21, 2023
$	1.94		19,443,910		0.96