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				9 Months Ended
	Apr. 30, 2024	Jan. 31, 2024	Oct. 31, 2023	Apr. 30, 2023	Apr. 30, 2024	Apr. 30, 2023
Number of Options Exercised on Cash Basis (in shares)	202,437			0	492,112	138,537
Number of Options Exercised on Forfeiture Basis (in shares)	203,974			337,500	1,400,984	2,727,295
Total Number of Options Exercised (in shares)	406,411	878,503	608,182	337,500	1,893,096	2,865,832
Number of Shares Issued on Cash Exercise (in shares)	202,437			0	492,112	138,537
Number of Shares Issued on Forfeiture Basis (in shares)	142,640			204,693	968,825	1,565,059
Total Number of Shares Issued Upon Exercise of Options (in shares)	345,077			204,693	1,460,937	1,703,596
Cash Received from Exercise of Stock Options	$ 281			$ 0	$ 681	$ 206
Total Intrinsic Value of Options Exercised	$ 2,431			$ 858	$ 9,022	$ 6,834