Note 12 - Stock-based Compensation - Summary of Outstanding Unvested RSUs (Details) - Restricted Stock Units (RSUs) [Member] $ / shares in Units, $ in Thousands	9 Months Ended
	Apr. 30, 2024 USD ($) $ / shares shares
Number of Restricted Stock Units (in shares) | shares	1,011,873
Grant Date Fair Value (in dollars per share) | $ / shares	$ 3.44
Remaining Life (Year)	1 year 9 months 29 days
Aggregate Intrinsic Value | $	$ 6,830
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)	3 months 21 days
Aggregate Intrinsic Value | $	$ 917
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 1 month 2 days
Aggregate Intrinsic Value | $	$ 265
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 3 months 29 days
Aggregate Intrinsic Value | $	$ 1,242
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 4 months 2 days
Aggregate Intrinsic Value | $	$ 4,188
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 9 months 3 days
Aggregate Intrinsic Value | $	$ 8
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)	9 months 25 days
Aggregate Intrinsic Value | $	$ 60
March 13, 2024 [Member]
Number of Restricted Stock Units (in shares) | shares	2,288
Grant Date Fair Value (in dollars per share) | $ / shares	$ 6.49
Remaining Life (Year)	11 months 12 days
Aggregate Intrinsic Value | $	$ 15
April 1, 2024 [Member]
Number of Restricted Stock Units (in shares) | shares	20,000
Grant Date Fair Value (in dollars per share) | $ / shares	$ 7.07
Remaining Life (Year)	3 years
Aggregate Intrinsic Value | $	$ 135