Note 10 - Other Loans Payable (Details Textual)		3 Months Ended		12 Months Ended
	May 05, 2020 USD ($)	Apr. 30, 2021 USD ($)	Apr. 30, 2021 CAD ($)	Jul. 31, 2021 USD ($)	Jul. 31, 2020 USD ($)	Jul. 31, 2020 CAD ($)
Repayments of Other Long-term Debt				$ 144,621
Gain (Loss) on Extinguishment of Debt, Total				286,376
CEBA Loan [Member]
Proceeds of Other Loans					$ 29,842	$ 40,000
Repayments of Other Long-term Debt			$ 30,000
Other Loans, Decrease, Forgiveness			$ 10,000
Gain (Loss) on Extinguishment of Debt, Total		$ 7,759
Paycheck Protection Program CARES Act [Member]
Proceeds of Other Loans	$ 277,250
Gain (Loss) on Extinguishment of Debt, Total				278,617
Promissory Note [Member]
Other Loans Payable, Total				$ 380,000
Other Loans, Interest Rate, Stated Percentage				5.00%
Interest Paid, Excluding Capitalized Interest, Operating Activities				$ 10,831