Note 13 - Capital Stock - Number of Shares Issued and Cash Received Upon Exercise of the Stock Options (Details) - USD ($)	3 Months Ended				9 Months Ended
	Apr. 30, 2022	Jan. 31, 2022	Oct. 31, 2021	Apr. 30, 2021	Apr. 30, 2022	Apr. 30, 2021
Number of Options Exercised on Cash Basis (in shares)	404,832			953,939	807,580	1,141,439
Number of Options Exercised on Forfeiture Basis (in shares)	777,773			988,909	1,650,402	1,930,691
Total Number of Options Exercised (in shares)	1,182,605	244,834	1,030,543	1,942,848	2,457,982	3,072,130
Number of Shares Issued on Cash Exercise (in shares)	404,832			953,939	807,580	1,141,439
Number of Shares Issued on Forfeiture Basis (in shares)	595,478			557,608	1,140,065	943,168
Total Number of Shares Issued Upon Exercise of Options (in shares)	1,000,310			1,511,547	1,947,645	2,084,607
Cash Received from Exercise of Stock Options	$ 403,949			$ 1,086,844	$ 851,132	$ 1,308,278
Total Intrinsic Value of Options Exercised	$ 4,890,780			$ 3,026,602	$ 7,685,293	$ 3,855,217