Note 12 - Capital Stock - Summary of Stock-based Compensation Expense (Details) - USD ($)	3 Months Ended
	Oct. 31, 2020	Oct. 31, 2019
Share-based Payment Arrangement, Noncash Expense, Total	$ 1,378,515	$ 917,386
Common stock issued	265,590	223,362
Settlement of share issuance obligation		(15,189)
Consultants [Member]
Common stock issued to consultants	119,470	107,608
Amortization of expenses	103,928	46,971
Share-based Payment Arrangement, Noncash Expense, Total	223,398	154,579
Management [Member]
Amortization of expenses	253,731	243,377
Share-based Payment Arrangement, Noncash Expense, Total	563,109	413,177
Common stock issued		34,707
Management [Member] | Restricted Stock Units (RSUs) and Performance Restricted Stock Units (PRSUs) [Member]
Amortization of expenses	309,378	135,093
Employees [Member]
Amortization of expenses	379,138	236,791
Share-based Payment Arrangement, Noncash Expense, Total	592,008	364,819
Common stock issued	$ 212,870	$ 128,028