Note 12 - 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, 2024	Oct. 31, 2023	Jan. 31, 2023	Jan. 31, 2024	Jan. 31, 2023
Number of Options Exercised on Cash Basis (in shares)	100,425		0	289,675	138,537
Number of Options Exercised on Forfeiture Basis (in shares)	778,078		197,110	1,197,010	2,389,795
Total Number of Options Exercised (in shares)	878,503	608,182	197,110	1,486,685	2,528,332
Number of Shares Issued on Cash Exercise (in shares)	100,425		0	289,675	138,537
Number of Shares Issued on Forfeiture Basis (in shares)	569,574		94,302	826,185	1,360,366
Total Number of Shares Issued Upon Exercise of Options (in shares)	669,999		94,302	1,115,860	1,498,903
Cash Received from Exercise of Stock Options	$ 137		$ 0	$ 400	$ 206
Total Intrinsic Value of Options Exercised	$ 4,561		$ 381	$ 6,591	$ 5,976