Note 13 - Capital Stock - Number of Shares Issued and Cash Received Upon Exercise of the Stock Options (Details) - USD ($) $ in Thousands	3 Months Ended			6 Months Ended
	Jan. 31, 2023	Oct. 31, 2022	Jan. 31, 2022	Jan. 31, 2023	Jan. 31, 2022
Number of Options Exercised on Cash Basis (in shares)	0		57,750	138,537	402,748
Number of Options Exercised on Forfeiture Basis (in shares)	197,110		187,084	2,389,795	872,629
Total Number of Options Exercised (in shares)	197,110	2,331,222	244,834	2,528,332	1,275,377
Number of Shares Issued on Cash Exercise (in shares)	0		57,750	138,537	402,748
Number of Shares Issued on Forfeiture Basis (in shares)	94,302		135,595	1,360,366	544,587
Total Number of Shares Issued Upon Exercise of Options (in shares)	94,302		193,345	1,498,903	947,335
Cash Received from Exercise of Stock Options	$ 0		$ 63	$ 206	$ 447
Total Intrinsic Value of Options Exercised	$ 381		$ 889	$ 5,976	$ 2,794