Note 17 - Stock-based Compensation - Summary of Outstanding Unvested RSUs (Details) - Restricted Stock Units (RSUs) [Member] - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Jul. 31, 2023	Jul. 31, 2022	Jul. 31, 2021	Jul. 31, 2020
Number of Restricted Stock Units (in shares)	979,500	836,034	997,612	1,615,000
Grant Date Fair Value (in dollars per share)	$ 3.32	$ 2.61	$ 1.42	$ 0.92
Remaining Life (Year)	2 years 5 months 23 days
Aggregate Intrinsic Value	$ 3,525
July 21, 2021 [Member]
Number of Restricted Stock Units (in shares)	135,875
Grant Date Fair Value (in dollars per share)	$ 2.15
Remaining Life (Year)	11 months 23 days
Aggregate Intrinsic Value	$ 489
May 01, 2022 [Member]
Number of Restricted Stock Units (in shares)	39,216
Grant Date Fair Value (in dollars per share)	$ 4.25
Remaining Life (Year)	1 year 9 months
Aggregate Intrinsic Value	$ 141
July 29, 2022 [Member]
Number of Restricted Stock Units (in shares)	184,023
Grant Date Fair Value (in dollars per share)	$ 3.98
Remaining Life (Year)	2 years
Aggregate Intrinsic Value	$ 662
July 31, 2023 [Member]
Number of Restricted Stock Units (in shares)	620,386
Grant Date Fair Value (in dollars per share)	$ 3.32
Remaining Life (Year)	3 years
Aggregate Intrinsic Value	$ 2,233