Note 15 - Income Taxes - Components of Income Tax Provision (Details) - USD ($)	12 Months Ended
	Jul. 31, 2019	Jul. 31, 2018	Jul. 31, 2017
Loss before income taxes	$ (17,167,161)	$ (18,534,145)	$ (18,005,411)
Corporate tax rate	21.52%	27.46%	35.43%
Expected tax recovery	$ (3,694,373)	$ (5,089,476)	$ (6,379,317)
Foreign tax rate differences	90,391	167,162	185,700
Permanent differences	2,427,665	434,863	446,377
Prior year true-up	(160,019)	(141,814)	(1,028,592)
Property acquisition			(491,798)
Foreign exchange rate differences	39,667	(41,014)	(3,248)
Other	(94,291)	35,706	81,660
Recognition of deferred tax assets		430,121
Change in valuation allowance	1,373,462	4,156,768	7,149,654
Tax adjustment from operations	(17,498)	(47,684)	(39,564)
Re-measurement of deferred tax liability at 21%		(232,843)
Recognition of deferred tax assets to offset deferred tax liability		(430,121)
Unrealized loss, other comprehensive loss	3,126	3,137	5,209
Deferred tax benefits	$ (14,372)	$ (707,511)	$ (34,355)