Note 12 - Stock-based Compensation - Summary of Outstanding Unvested RSUs (Details) - Restricted Stock Units (RSUs) [Member] $ / shares in Units, $ in Thousands	6 Months Ended
	Jan. 31, 2024 USD ($) $ / shares shares
Number of Restricted Stock Units (in shares) | shares	989,585
Grant Date Fair Value (in dollars per share) | $ / shares	$ 3.36
Remaining Life (Year)	1 year 11 months 23 days
Aggregate Intrinsic Value | $	$ 7,561
July 21, 2021 [Member]
Number of Restricted Stock Units (in shares) | shares	135,875
Grant Date Fair Value (in dollars per share) | $ / shares	$ 2.15
Remaining Life (Year)	5 months 19 days
Aggregate Intrinsic Value | $	$ 1,038
May 01, 2022 [Member]
Number of Restricted Stock Units (in shares) | shares	39,216
Grant Date Fair Value (in dollars per share) | $ / shares	$ 4.25
Remaining Life (Year)	1 year 3 months
Aggregate Intrinsic Value | $	$ 300
July 29, 2022 [Member]
Number of Restricted Stock Units (in shares) | shares	184,023
Grant Date Fair Value (in dollars per share) | $ / shares	$ 3.98
Remaining Life (Year)	1 year 5 months 26 days
Aggregate Intrinsic Value | $	$ 1,406
July 31, 2023 [Member]
Number of Restricted Stock Units (in shares) | shares	620,386
Grant Date Fair Value (in dollars per share) | $ / shares	$ 3.32
Remaining Life (Year)	2 years 6 months
Aggregate Intrinsic Value | $	$ 4,740
January 2, 2024 [Member]
Number of Restricted Stock Units (in shares) | shares	1,166
Grant Date Fair Value (in dollars per share) | $ / shares	$ 6.44
Remaining Life (Year)	2 years 11 months 1 day
Aggregate Intrinsic Value | $	$ 9
January 22, 2024 [Member]
Number of Restricted Stock Units (in shares) | shares	8,919
Grant Date Fair Value (in dollars per share) | $ / shares	$ 7.63
Remaining Life (Year)	2 years 11 months 23 days
Aggregate Intrinsic Value | $	$ 68