Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands	Common Stock [Member] Direct Offering [Member]	Common Stock [Member]	Additional Paid-in Capital [Member] Direct Offering [Member]	Additional Paid-in Capital [Member]	Share Issuance Obligation [Member] Direct Offering [Member]	Share Issuance Obligation [Member]	Retained Earnings [Member] Direct Offering [Member]	Retained Earnings [Member]	AOCI Attributable to Parent [Member] Direct Offering [Member]	AOCI Attributable to Parent [Member]	Direct Offering [Member]	Total
Balance (in shares) at Jul. 31, 2020		184,635,870
Balance at Jul. 31, 2020		$ 185		$ 341,059		$ 104		$ (276,812)		$ (120)		$ 64,416
Issued under ATM offering, net of issuance costs (in shares)	26,136,364	15,934,606
Issued under ATM offering, net of issuance costs	$ 26	$ 16	$ 52,515	35,219	$ 0	0	$ 0	0	$ 0	0	$ 52,541	35,235
Issued upon vesting of RSUs and PRSUs (in shares)		536,361
Issued upon vesting of RSUs and PRSUs		$ 1		(1,255)		256		0		0		$ (998)
Issued upon exercise of stock options (in shares)		3,326,255										3,326,255
Issued upon exercise of stock options		$ 3		1,913		0		0		0		$ 1,916
Issued upon exercise of warrants (in shares)		3,692,865
Issued upon exercise of warrants		$ 4		3,585		0		0		0		3,589
Common stock issued for consulting services (in shares)		312,302
Common stock issued for consulting services		$ 0		953		0		0		0		953
Common stock issued under Stock Incentive Plan (in shares)		973,204
Common stock issued under Stock Incentive Plan		$ 1		1,593		0		0		0		1,594
Amortization of stock-based compensation		0		3,260		0		0		0		3,260
Net loss for the year		0		0		0		(14,813)		0		(14,813)
Other comprehensive income (loss)		$ 0		0		0		0		613		613
Issued as anniversary fees for credit facility (in shares)		1,249,039
Issued as anniversary fees for credit facility		$ 1		1,169		0		0		0		1,170
Issued in connection with ATM offering		0		1,518		0		0		0		1,518
Issued in connection with a direct offering as issuance costs		$ 0		461		0		0		0		461
Balance (in shares) at Jul. 31, 2021		236,796,866
Balance at Jul. 31, 2021		$ 237		441,990		360		(291,625)		493		151,455
Issued under ATM offering, net of issuance costs (in shares)		47,507,536
Issued under ATM offering, net of issuance costs		$ 48		163,707		0		0		0		163,755
Issued upon vesting of RSUs and PRSUs (in shares)		628,803
Issued upon vesting of RSUs and PRSUs		$ 0		(2,188)		(360)		0		0		$ (2,548)
Issued upon exercise of stock options (in shares)		2,152,095										2,152,095
Issued upon exercise of stock options		$ 2		932		0		0		0		$ 934
Issued upon exercise of warrants (in shares)		1,771,869
Issued upon exercise of warrants		$ 2		3,323		0		0		0		3,325
Common stock issued for consulting services (in shares)		56,273
Common stock issued for consulting services		$ 0		187		0		0		0		187
Common stock issued under Stock Incentive Plan (in shares)		451,407
Common stock issued under Stock Incentive Plan		$ 0		1,478		0		0		0		1,478
Amortization of stock-based compensation		0		2,724		0		0		0		2,724
Net loss for the year		0		0		0		5,252		0		5,252
Other comprehensive income (loss)		$ 0		0		0		0		(679)		(679)
Issued as anniversary fees for credit facility (in shares)		161,594
Issued as anniversary fees for credit facility		$ 0		600		0		0		0		600
Issued for acquisition of mineral properties (in shares)		111,864
Issued for acquisition of mineral properties		$ 0		426		0		0		0		426
Balance (in shares) at Jul. 31, 2022		289,638,307
Balance at Jul. 31, 2022		$ 289		613,179		$ 0		(286,373)		(186)		326,909
Issued under ATM offering, net of issuance costs (in shares)		15,171,253
Issued under ATM offering, net of issuance costs		$ 15		58,405				0		0		58,420
Issued upon vesting of RSUs and PRSUs (in shares)		261,232
Issued upon vesting of RSUs and PRSUs		$ 0		(645)				0		0		$ (645)
Issued upon exercise of stock options (in shares)		2,351,544										2,351,544
Issued upon exercise of stock options		$ 3		152				0		0		$ 155
Issued upon exercise of warrants (in shares)		4,359,086
Issued upon exercise of warrants		$ 5		8,846				0		0		8,851
Issued for acquisition of UEX and Roughrider (in shares)		66,359,126
Issued for acquisition of UEX and Roughrider		$ 66		239,447				0		0		239,513
Common stock issued for consulting services (in shares)		53,407
Common stock issued for consulting services		$ 0		218				0		0		218
Common stock issued under Stock Incentive Plan (in shares)		258,909
Common stock issued under Stock Incentive Plan		$ 0		945				0		0		945
Amortization of stock-based compensation		0		4,190				0		0		4,190
Net loss for the year		0		0				(3,307)		0		(3,307)
Other comprehensive income (loss)		$ 0		0				0		(3,422)		(3,422)
Balance (in shares) at Jul. 31, 2023		378,452,864
Balance at Jul. 31, 2023		$ 378		$ 924,737				$ (289,680)		$ (3,608)		$ 631,827