Note 8 - Investments in Equity Securities (Details Textual) - USD ($) $ in Thousands			6 Months Ended
	Jan. 12, 2026	Aug. 01, 2025	Jan. 31, 2026	Feb. 27, 2026	Jul. 31, 2025
Equity Securities, FV-NI			$ 83,963		$ 28,470
Equity Securities, FV-NI, Unrealized Loss			11,740
Anfield Energy, Inc. [Member]
Consolidation of Stock, Shares Issued (in shares)		1
Consolidation of Stock, Shares Consolidated (in shares)		75
Anfield Common Shares and Subscription Receipts [Member]
Equity Securities, FV-NI			48,710		26,140
Anfield Warrant [Member]
Equity Securities, FV-NI			$ 2,470		$ 1,390
Anfield Energy, Inc. [Member]
Investment Owned, Balance, Shares (in shares)			4,978,876		4,978,876
Ownership of Common Stock, Non-diluted Basis			28.80%		31.80%
Ownership of Common Stock, Partially Diluted Basis			33.70%		37.00%
Anfield Energy, Inc. [Member] | Anfield Subscription Rights [Member]
Investment Owned, Balance, Shares (in shares)	896,861
Payments to Acquire Investments	$ 4,000
Anfield Energy, Inc. [Member] | Anfield Subscription Rights [Member] | Subsequent Event [Member]
Investment Owned, Warrants Exercised, Assumed (in shares)				896,861
Anfield Energy, Inc. [Member] | Anfield Warrant [Member]
Investment Owned, Warrants Exercised, Assumed (in shares)			1,283,639