Note 8 - Investments in Equity Securities (Details Textual) $ in Thousands	9 Months Ended
Apr. 30, 2024 USD ($)
Equity Securities, FV-NI, Unrealized Gain	$ 8,555

Amount of unrealized gain on investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 321
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 4
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479536/321-10-50-4

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration