Note 15 - Income Taxes - Components of Income Tax Provision (Details) - USD ($)	12 Months Ended
	Jul. 31, 2020	Jul. 31, 2019	Jul. 31, 2018
Loss before income taxes	$ (14,616,067)	$ (17,167,161)	$ (18,534,145)
Corporate tax rate	21.72%	21.52%	27.46%
Expected tax recovery	$ (3,174,610)	$ (3,694,373)	$ (5,089,476)
Foreign tax rate differences	85,796	90,391	167,162
Permanent differences	170,023	2,427,665	434,863
Prior year true-up	(435,565)	(160,019)	(141,814)
Foreign exchange rate differences	17,456	39,667	(41,014)
Other	71,805	(94,291)	35,706
Recognition of deferred tax assets			430,121
Change in valuation allowance	3,233,427	1,373,462	4,156,768
Tax adjustment from operations	(31,668)	(17,498)	(47,684)
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	26,117	3,126	3,137
Deferred tax benefits	$ (5,551)	$ (14,372)	$ (707,511)