Note 13 - Capital Stock - Number of Shares Issued and Cash Received Upon Exercise of the Stock Options (Details) - USD ($)	3 Months Ended			6 Months Ended
	Jan. 31, 2022	Oct. 31, 2021	Jan. 31, 2021	Jan. 31, 2022	Jan. 31, 2021
Number of Options Exercised on Cash Basis (in shares)	57,750		177,500	402,748	187,500
Number of Options Exercised on Forfeiture Basis (in shares)	187,084		923,282	872,629	941,782
Total Number of Options Exercised (in shares)	244,834	1,030,543	1,100,782	1,275,377	1,129,282
Number of Shares Issued on Cash Exercise (in shares)	57,750		177,500	402,748	187,500
Number of Shares Issued on Forfeiture Basis (in shares)	135,595		382,028	544,587	385,560
Total Number of Shares Issued Upon Exercise of Options (in shares)	193,345		559,528	947,335	573,060
Cash Received from Exercise of Stock Options	$ 63,404		$ 212,125	$ 447,183	$ 221,434
Total Intrinsic Value of Options Exercised	$ 889,296		$ 822,237	$ 2,794,512	$ 828,615