Note 15 - Stock-based Compensation - Number of Shares Issued and Cash Received upon Exercise of the Stock Options (Details) - USD ($) $ in Thousands	12 Months Ended
	Jul. 31, 2022	Jul. 31, 2021	Jul. 31, 2020
Number of Options Exercised on Cash Basis (in shares)	872,580	1,734,127	0
Number of Options Exercised on Forfeiture Basis (in shares)	1,855,918	2,970,878	0
Total Number of Options Exercised (in shares)	2,728,498	4,705,005	0
Number of Shares Issued on Cash Exercise (in shares)	872,580	1,734,127	0
Number of Shares Issued on Forfeiture Basis (in shares)	1,279,515	1,592,128	0
Total Number of Shares Issued Upon Exercise of Options (in shares)	2,152,095	3,326,255	0
Cash Received from Exercise of Stock Options	$ 934	$ 1,916	$ 0
Total Intrinsic Value of Options Exercised	$ 8,336	$ 6,882	$ 0