Note 13 - Capital Stock - Summary of Outstanding Unvested RSUs (Details) - Restricted Stock Units (RSUs) [Member] $ / shares in Units, $ in Thousands	3 Months Ended
	Oct. 31, 2022 USD ($) $ / shares shares
Number of Restricted Stock Units (in shares) | shares	836,034
Grant Date Fair Value (in dollars per share) | $ / shares	$ 2.61
Remaining Life (Year)	1 year 10 months 13 days
Aggregate Intrinsic Value | $	$ 3,520
July 16, 2020 [Member]
Number of Restricted Stock Units (in shares) | shares	217,498
Grant Date Fair Value (in dollars per share) | $ / shares	$ 0.91
Remaining Life (Year)	8 months 15 days
Aggregate Intrinsic Value | $	$ 916
July 21, 2021 [Member]
Number of Restricted Stock Units (in shares) | shares	271,746
Grant Date Fair Value (in dollars per share) | $ / shares	$ 2.15
Remaining Life (Year)	1 year 8 months 19 days
Aggregate Intrinsic Value | $	$ 1,144
May 01, 2022 [Member]
Number of Restricted Stock Units (in shares) | shares	58,824
Grant Date Fair Value (in dollars per share) | $ / shares	$ 4.25
Remaining Life (Year)	2 years 6 months
Aggregate Intrinsic Value | $	$ 248
July 29, 2022 [Member]
Number of Restricted Stock Units (in shares) | shares	287,966
Grant Date Fair Value (in dollars per share) | $ / shares	$ 3.98
Remaining Life (Year)	2 years 9 months
Aggregate Intrinsic Value | $	$ 1,212