Note 12 - Stock-based Compensation - Summary of Outstanding Unvested RSUs (Details) - Restricted Stock Units (RSUs) [Member] $ / shares in Units, $ in Thousands	3 Months Ended
	Oct. 31, 2024 USD ($) $ / shares shares
Number of Restricted Stock Units (in shares) | shares	1,185,200
Grant Date Fair Value (in dollars per share) | $ / shares	$ 4.65
Remaining Life (Year)	2 years 3 months
Aggregate Intrinsic Value | $	$ 8,794
May 01, 2022 [Member]
Number of Restricted Stock Units (in shares) | shares	19,608
Grant Date Fair Value (in dollars per share) | $ / shares	$ 4.25
Remaining Life (Year)	6 months 29 days
Aggregate Intrinsic Value | $	$ 145
July 29, 2022 [Member]
Number of Restricted Stock Units (in shares) | shares	92,015
Grant Date Fair Value (in dollars per share) | $ / shares	$ 3.98
Remaining Life (Year)	9 months 29 days
Aggregate Intrinsic Value | $	$ 683
July 31, 2023 [Member]
Number of Restricted Stock Units (in shares) | shares	413,593
Grant Date Fair Value (in dollars per share) | $ / shares	$ 3.32
Remaining Life (Year)	1 year 9 months 29 days
Aggregate Intrinsic Value | $	$ 3,069
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 3 months 3 days
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)	3 months 21 days
Aggregate Intrinsic Value | $	$ 66
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)	5 months 12 days
Aggregate Intrinsic Value | $	$ 17
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)	2 years 6 months
Aggregate Intrinsic Value | $	$ 148
July 26, 2024 [Member]
Number of Restricted Stock Units (in shares) | shares	610,091
Grant Date Fair Value (in dollars per share) | $ / shares	$ 5.49
Remaining Life (Year)	2 years 9 months 25 days
Aggregate Intrinsic Value | $	$ 4,527
September 1, 2024 [Member]
Number of Restricted Stock Units (in shares) | shares	1,417
Grant Date Fair Value (in dollars per share) | $ / shares	$ 5.23
Remaining Life (Year)	11 months 1 day
Aggregate Intrinsic Value | $	$ 11
October 1, 2024 [Member]
Number of Restricted Stock Units (in shares) | shares	16,103
Grant Date Fair Value (in dollars per share) | $ / shares	$ 6.21
Remaining Life (Year)	3 years
Aggregate Intrinsic Value | $	$ 119