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
	Oct. 31, 2024	Oct. 31, 2023
Number of Options Exercised on a Cash Basis (in shares)	46,275	189,250
Number of Options Exercised on a Non-Cash Basis (in shares)	127,100	418,932
Total Number of Options Exercised (in shares)	173,375	608,182
Number of Shares Issued on a Cash Basis (in shares)	46,275	189,250
Number of Shares Issued on a Non-Cash Basis (in shares)	74,762	256,611
Total Number of Shares Issued Upon Exercise of Options (in shares)	121,037	445,861
Cash Received from Exercise of Stock Options	$ 120	$ 264
Total Intrinsic Value of Options Exercised	$ 809	$ 2,030