Condensed Consolidated Statements of Stockholders' Equity (Unaudited) - USD ($)	At-the-market Offering [Member] Common Stock [Member]	At-the-market Offering [Member] Additional Paid-in Capital [Member]	At-the-market Offering [Member] Share Issuance Obligation [Member]	At-the-market Offering [Member] Retained Earnings [Member]	At-the-market Offering [Member] AOCI Attributable to Parent [Member]	At-the-market Offering [Member]	Direct Offering [Member] Common Stock [Member]	Direct Offering [Member] Additional Paid-in Capital [Member]	Direct Offering [Member] Share Issuance Obligation [Member]	Direct Offering [Member] Retained Earnings [Member]	Direct Offering [Member] AOCI Attributable to Parent [Member]	Direct Offering [Member]	Common Stock [Member]	Additional Paid-in Capital [Member]	Share Issuance Obligation [Member]	Retained Earnings [Member]	AOCI Attributable to Parent [Member]	Total
Balance (in shares) at Jul. 31, 2019													180,896,431
Balance at Jul. 31, 2019													$ 180,896	$ 336,047,595	$ 187,100	$ (262,200,784)	$ 12,461	$ 74,227,268
Common stock issued under Stock Incentive Plan (in shares)													435,348
Common stock issued under Stock Incentive Plan													$ 436	410,026	(187,100)			223,362
Amortization of stock-based compensation														662,232				662,232
Net loss for the period																(5,042,577)		(5,042,577)
Other comprehensive income (loss)																	(9,894)	(9,894)
Common stock issued for consulting services													$ 29	31,763				31,792
Common stock issued for consulting services (in shares)													29,167
Balance (in shares) at Oct. 31, 2019													181,360,946
Balance at Oct. 31, 2019													$ 181,361	337,151,616		(267,243,361)	2,567	70,092,183
Balance (in shares) at Jul. 31, 2019													180,896,431
Balance at Jul. 31, 2019													$ 180,896	336,047,595	187,100	(262,200,784)	12,461	$ 74,227,268
Issued upon exercise of stock options (in shares)
Net loss for the period																		$ (10,204,882)
Other comprehensive income (loss)																		(528,690)
Balance (in shares) at Apr. 30, 2020													184,050,113
Balance at Apr. 30, 2020													$ 184,050	340,198,573		(272,405,666)	(516,229)	67,460,728
Balance (in shares) at Oct. 31, 2019													181,360,946
Balance at Oct. 31, 2019													$ 181,361	337,151,616		(267,243,361)	2,567	70,092,183
Common stock issued under Stock Incentive Plan (in shares)													256,206
Common stock issued under Stock Incentive Plan													$ 257	234,535				234,792
Amortization of stock-based compensation														485,268				485,268
Net loss for the period																(1,888,661)		(1,888,661)
Other comprehensive income (loss)																	(39,648)	(39,648)
Issued as anniversary fees for credit facility (in shares)													1,743,462
Issued as anniversary fees for credit facility													$ 1,743	1,398,257				1,400,000
Common stock issued for consulting services													$ 313	277,644				277,957
Common stock issued for consulting services (in shares)													313,201
Issued for consulting services, warrants														22,733				22,733
Balance (in shares) at Jan. 31, 2020													183,673,815
Balance at Jan. 31, 2020													$ 183,674	339,570,053		(269,132,022)	(37,081)	$ 70,584,624
Issued upon exercise of stock options (in shares)
Common stock issued under Stock Incentive Plan (in shares)													376,298
Common stock issued under Stock Incentive Plan													$ 376	246,826				$ 247,202
Amortization of stock-based compensation														381,694				381,694
Net loss for the period																(3,273,644)		(3,273,644)
Other comprehensive income (loss)																	(479,148)	(479,148)
Balance (in shares) at Apr. 30, 2020													184,050,113
Balance at Apr. 30, 2020													$ 184,050	340,198,573		(272,405,666)	(516,229)	67,460,728
Balance (in shares) at Jul. 31, 2020													184,635,870
Balance at Jul. 31, 2020													$ 184,636	341,059,972	103,554	(276,811,300)	(120,244)	64,416,618
Issued for equity financing, net of issuance costs (in shares)													12,500,000
Issued for equity financing, net of issuance costs													$ 12,500	12,455,787				12,468,287
Issued upon exercise of stock options (in shares)													13,532
Issued upon exercise of stock options													$ 15	9,294				9,309
Common stock issued under Stock Incentive Plan (in shares)													227,390
Common stock issued under Stock Incentive Plan													$ 226	235,043	30,321			265,590
Amortization of stock-based compensation														1,046,175				1,046,175
Issued for equity financing														1,518,432				1,518,432
Issued for equity financing as issuance costs														134,937				134,937
Net loss for the period																(4,963,537)		(4,963,537)
Other comprehensive income (loss)																	62,761	62,761
Balance (in shares) at Oct. 31, 2020													197,376,792
Balance at Oct. 31, 2020													$ 197,377	356,459,640	133,875	(281,774,837)	(57,483)	74,958,572
Balance (in shares) at Jul. 31, 2020													184,635,870
Balance at Jul. 31, 2020													$ 184,636	341,059,972	103,554	(276,811,300)	(120,244)	$ 64,416,618
Issued upon exercise of stock options (in shares)																		2,084,607
Net loss for the period																		$ (13,014,757)
Other comprehensive income (loss)																		$ 1,041,900
Stock issued (in shares)						13,668,906
Issued as anniversary fees for credit facility (in shares)																		1,249,039
Issued as anniversary fees for credit facility																		$ 1,170,000
Issued upon exercise of warrants (in shares)																		3,599,250
Balance (in shares) at Apr. 30, 2021													232,365,705
Balance at Apr. 30, 2021													$ 232,365	434,908,779	103,554	(289,826,057)	921,656	$ 146,340,297
Balance (in shares) at Oct. 31, 2020													197,376,792
Balance at Oct. 31, 2020													$ 197,377	356,459,640	133,875	(281,774,837)	(57,483)	74,958,572
Issued upon exercise of stock options (in shares)													559,528
Issued upon exercise of stock options													$ 559	211,566				212,125
Common stock issued under Stock Incentive Plan (in shares)													323,660
Common stock issued under Stock Incentive Plan													$ 324	358,359	(30,321)			328,362
Amortization of stock-based compensation														836,569				836,569
Net loss for the period																(3,461,059)		(3,461,059)
Other comprehensive income (loss)																	486,038	486,038
Stock issued (in shares)	632,487
Stock issued	$ 632	$ 1,073,705				$ 1,074,337
Issued as anniversary fees for credit facility (in shares)													1,249,039
Issued as anniversary fees for credit facility													$ 1,249	1,168,751				1,170,000
Issued upon exercise of warrants (in shares)													1,050
Issued upon exercise of warrants													$ 1	1,889				1,890
Common stock issued for consulting services															40,009			40,009
Balance (in shares) at Jan. 31, 2021													200,142,556
Balance at Jan. 31, 2021													$ 200,142	360,110,479	143,563	(285,235,896)	428,555	$ 75,646,843
Issued upon exercise of stock options (in shares)													1,511,547					1,511,547
Issued upon exercise of stock options													$ 1,512	1,085,332				$ 1,086,844
Common stock issued under Stock Incentive Plan (in shares)													149,614
Common stock issued under Stock Incentive Plan													$ 150	307,981				308,131
Amortization of stock-based compensation														674,196				674,196
Issued for equity financing as issuance costs														326,528				326,528
Net loss for the period																(4,590,161)		(4,590,161)
Other comprehensive income (loss)																	493,101	$ 493,101
Stock issued (in shares)	13,036,419						13,636,364
Stock issued	$ 13,036	$ 28,058,564				$ 28,071,600	$ 13,636	$ 40,059,512				$ 40,073,148
Issued upon exercise of warrants (in shares)													3,598,200					3,598,200
Issued upon exercise of warrants													$ 3,598	3,395,705				$ 3,399,303
Common stock issued for consulting services													$ 291	890,482	(40,009)			850,764
Common stock issued for consulting services (in shares)													291,005
Balance (in shares) at Apr. 30, 2021													232,365,705
Balance at Apr. 30, 2021													$ 232,365	$ 434,908,779	$ 103,554	$ (289,826,057)	$ 921,656	$ 146,340,297