Note 13 - Stock-Based Compensation - 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, 2025	Oct. 31, 2024	Jan. 31, 2024	Jan. 31, 2025	Jan. 31, 2024
Number of Options Exercised on a Cash Basis (in shares)	2,438		100,425	48,713	289,675
Number of Options Exercised on a Non-Cash Basis (in shares)	61,414		778,078	188,514	1,197,010
Total Number of Options Exercised (in shares)	63,852	173,375	878,503	237,227	1,486,685
Number of Shares Issued on a Cash Basis (in shares)	2,438		100,425	48,713	289,675
Number of Shares Issued on a Non-Cash Basis (in shares)	35,627		569,574	110,389	826,185
Total Number of Shares Issued Upon Exercise of Options (in shares)	38,065		669,999	159,102	1,115,860
Cash Received from Exercise of Stock Options	$ 9		$ 137	$ 129	$ 400
Total Intrinsic Value of Options Exercised	$ 301		$ 4,561	$ 1,110	$ 6,591