Note 19 - Income Taxes - Components of Income (Loss) from Operations Before Income Taxes, by Tax Jurisdiction (Details) - USD ($) $ in Thousands	12 Months Ended
	Jul. 31, 2022	Jul. 31, 2021	Jul. 31, 2020
Income (loss) from operations before income taxes	$ 5,247	$ (14,817)	$ (14,616)
Domestic Tax Authority [Member] | Internal Revenue Service (IRS) [Member]
Income (loss) from operations before income taxes	6,054	(14,297)	(13,962)
Foreign Tax Authority [Member] | Canada Revenue Agency [Member]
Income (loss) from operations before income taxes	268	94	54
Foreign Tax Authority [Member] | Tax Administration of Paraguay [Member]
Income (loss) from operations before income taxes	$ (1,075)	$ (614)	$ (708)