Note 11 - 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, 2026	Jan. 31, 2025	Jan. 31, 2026	Jan. 31, 2025
Number of Options Exercised on a Cash Basis (in shares)	162,400	2,438	351,817	48,713
Number of Options Exercised on a Non-Cash Basis (in shares)	22,100	61,414	689,903	188,514
Total Number of Options Exercised (in shares)	184,500	63,852	1,041,720	237,227
Number of Shares Issued on a Cash Basis (in shares)	162,400	2,438	351,817	48,713
Number of Shares Issued on a Non-Cash Basis (in shares)	16,068	35,627	539,956	110,389
Total Number of Shares Issued Upon Exercise of Options (in shares)	178,468	38,065	891,773	159,102
Cash Received from Exercise of Stock Options	$ 270	$ 9	$ 911	$ 129
Total Intrinsic Value of Options Exercised	$ 1,744	$ 301	$ 9,292	$ 1,110