Note 12 - Capital Stock (Tables)

3 Months Ended

Oct. 31, 2019

Notes Tables

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		0.22	January 20, 2020
	1.35		2,450,000		0.25	January 30, 2020
	2.05		7,063,253		1.42	April 3, 2021
	2.30		308,728		2.77	August 9, 2022
	1.64		50,000		3.55	May 21, 2023
$	1.94		19,443,910		0.71

Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]

Date	Options Granted		Exercise Price		Term (Years)		Fair Value		Expected Life (Years)		Risk-Free Interest Rate			Dividend Yield			Expected Volatility
August 7, 2019		597,650	$	0.91		10.00	$	303,160		5.00		1.51	%		0.00	%		66.10	%

Share-based Payment Arrangement, Option, Activity [Table Text Block]

	Number of Stock Options			Weighted Average Exercise Price
Balance, July 31, 2019		15,738,350		$	1.30
Granted		597,650			0.91
Expired		(5,990,000	)		1.34
Balance, October 31, 2019		10,346,000		$	1.25

Disclosure of Share-based Compensation Arrangements by Share-based Payment Award [Table Text Block]

	Number of Unvested Stock Options			Weighted Average Grant-Date Fair Value
Balance, July 31, 2019		3,310,600		$	0.59
Granted		597,650			0.51
Vested		(645,550	)		0.61
Balance, October 31, 2019		3,262,700		$	0.57

Share-based Payment Arrangement, Option, Exercise Price Range [Table Text Block]

			Options Outstanding						Options Exercisable
Range of Exercise Price			Outstanding at October 31, 2019		Weighted Average Exercise Price		Weighted Average Remaining Contractual Term (Years)		Exercisable at October 31, 2019		Weighted Averag e Exercise Price		Weighted Average Remaining Contractual Term (Years)
$0.91	to	$0.99		4,240,750	$	0.94		6.38		2,001,300	$	0.94		2.60
$1.00	to	$1.49		3,610,000		1.22		2.15		3,545,000		1.22		2.11
$1.50	to	$3.75		2,495,250		1.84		3.21		1,537,000		2.03		2.88
				10,346,000	$	1.25		4.14		7,083,300	$	1.32		2.42

Share-based Payment Arrangement, Cost by Plan [Table Text Block]

	Three Months Ended October 31,
	2019			2018
Stock-Based Compensation for Consultants
Common stock issued for consulting services	$	107,608		$	130,803
Amortization of stock option expenses		46,971			54,402
		154,579			185,205
Stock-Based Compensation for Management
Common stock issued to management		34,707			35,343
Amortization of stock option expenses		243,377			216,804
Amortization of RSU & PRSU expenses		135,093			-
		413,177			252,147
Stock-Based Compensation for Employees
Common stock issued to employees		128,028			123,822
Amortization of stock option expenses		236,791			280,350
		364,819			404,172
Settlement of share issuance obligation		(15,189	)		-
	$	917,386		$	841,524