Note 17 - Stock-Based Compensation - Summary of Outstanding Unvested RSUs (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Jul. 31, 2024	Jul. 31, 2023	Jul. 31, 2022	Jul. 31, 2021
Grant Date Fair Value (in dollars per share)	$ 4.56	$ 3.29	$ 3.24	$ 1.67
Grant Date Fair Value (in dollars per share)	$ 4.56	$ 3.29	$ 3.24	$ 1.67
Restricted Stock Units (RSUs) [Member]
Number of Restricted Stock Units (in shares)	1,167,680	979,500	836,034	997,612
Grant Date Fair Value (in dollars per share)	$ 4.63	$ 3.32	$ 2.61	$ 1.42
Remaining Life (Year)	2 years 6 months
Aggregate Intrinsic Value	$ 6,926
Number of Restricted Stock Units (in shares)	1,167,680	979,500	836,034	997,612
Grant Date Fair Value (in dollars per share)	$ 4.63	$ 3.32	$ 2.61	$ 1.42
Remaining Life (Year)	2 years 6 months
Aggregate Intrinsic Value	$ 6,926
Restricted Stock Units (RSUs) [Member] | July 29, 2022 [Member]
Number of Restricted Stock Units (in shares)	92,015
Grant Date Fair Value (in dollars per share)	$ 3.98
Remaining Life (Year)	1 year 29 days
Aggregate Intrinsic Value	$ 546
Number of Restricted Stock Units (in shares)	92,015
Grant Date Fair Value (in dollars per share)	$ 3.98
Remaining Life (Year)	1 year 29 days
Aggregate Intrinsic Value	$ 546
Restricted Stock Units (RSUs) [Member] | July 31, 2023 [Member]
Number of Restricted Stock Units (in shares)	413,593
Grant Date Fair Value (in dollars per share)	$ 3.32
Remaining Life (Year)	2 years 29 days
Aggregate Intrinsic Value	$ 2,453
Number of Restricted Stock Units (in shares)	413,593
Grant Date Fair Value (in dollars per share)	$ 3.32
Remaining Life (Year)	2 years 29 days
Aggregate Intrinsic Value	$ 2,453
Restricted Stock Units (RSUs) [Member] | January 2, 2024 [Member]
Number of Restricted Stock Units (in shares)	1,166
Grant Date Fair Value (in dollars per share)	$ 6.44
Remaining Life (Year)	2 years 6 months 3 days
Aggregate Intrinsic Value	$ 7
Number of Restricted Stock Units (in shares)	1,166
Grant Date Fair Value (in dollars per share)	$ 6.44
Remaining Life (Year)	2 years 6 months 3 days
Aggregate Intrinsic Value	$ 7
Restricted Stock Units (RSUs) [Member] | January 22, 2024 [Member]
Number of Restricted Stock Units (in shares)	8,919
Grant Date Fair Value (in dollars per share)	$ 7.63
Remaining Life (Year)	6 months 21 days
Aggregate Intrinsic Value	$ 53
Number of Restricted Stock Units (in shares)	8,919
Grant Date Fair Value (in dollars per share)	$ 7.63
Remaining Life (Year)	6 months 21 days
Aggregate Intrinsic Value	$ 53
Restricted Stock Units (RSUs) [Member] | March 13, 2024 [Member]
Number of Restricted Stock Units (in shares)	2,288
Grant Date Fair Value (in dollars per share)	$ 6.49
Remaining Life (Year)	8 months 12 days
Aggregate Intrinsic Value	$ 14
Number of Restricted Stock Units (in shares)	2,288
Grant Date Fair Value (in dollars per share)	$ 6.49
Remaining Life (Year)	8 months 12 days
Aggregate Intrinsic Value	$ 14
Restricted Stock Units (RSUs) [Member] | April 1, 2024 [Member]
Number of Restricted Stock Units (in shares)	20,000
Grant Date Fair Value (in dollars per share)	$ 7.07
Remaining Life (Year)	2 years 9 months
Aggregate Intrinsic Value	$ 119
Number of Restricted Stock Units (in shares)	20,000
Grant Date Fair Value (in dollars per share)	$ 7.07
Remaining Life (Year)	2 years 9 months
Aggregate Intrinsic Value	$ 119
Restricted Stock Units (RSUs) [Member] | July 26, 2024 [Member]
Number of Restricted Stock Units (in shares)	610,091
Grant Date Fair Value (in dollars per share)	$ 5.49
Remaining Life (Year)	3 years 25 days
Aggregate Intrinsic Value	$ 3,618
Number of Restricted Stock Units (in shares)	610,091
Grant Date Fair Value (in dollars per share)	$ 5.49
Remaining Life (Year)	3 years 25 days
Aggregate Intrinsic Value	$ 3,618