Note 19 - Income Taxes (Details Textual) $ in Thousands, $ in Millions	12 Months Ended
Jul. 31, 2022 USD ($)	Jul. 31, 2022 CAD ($)	Jul. 31, 2021 USD ($)	Jul. 31, 2021 CAD ($)
Current Tax Expense (Benefit)	$ 0
Percentage of Valuation Allowance Recorded from Income Taxes	100.00%
Domestic Tax Authority [Member] \| Internal Revenue Service (IRS) [Member]
Operating Loss Carryforwards	$ 199,000	$ 4.5	$ 95,900	$ 5.5

Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (a)
-URI https://asc.fasb.org/extlink&oid=121826272&loc=d3e32559-109319

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant