Note 3 - Acquisition of Uranium One Americas, Inc. (Details Textual) - USD ($) $ in Thousands			12 Months Ended
		Dec. 17, 2021	Jul. 31, 2022	Jul. 31, 2021	Jul. 31, 2020
Business Combination, Acquisition Related Costs			$ 3,444	$ 0	$ 0
U1A Acquisition [Member]
Business Combination, Consideration Transferred, Total		$ 128,495	128,495
Business Combination, Acquisition Related Costs			3,444
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents	[1]		1,183
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Prepaid Expense and Other Assets	[1]		1,550
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Other	[1]		73
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Inventory	[1]		192
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Accounts Payable and Accrued Liabilities	[1]		96
Business Combination, Pro Forma Information, Earnings or Loss of Acquiree since Acquisition Date, Actual			15,616
Business Combination, Pro Forma Information, Operating Costs of Acquiree since Acquisition Date, Actual			$ 4,206

[1] The working capital adjustment represents the working capital of U1A at the date of the U1A Acquisition, which was comprised of: (i) cash and cash equivalents of $1,183; (ii) prepaid expenses and deposits of $1,550; (iii) other current assets of $73; (iv) inventories of $192; and (v) accounts payable and accrued liabilities of $96. The fair value of these working capital items approximates their respective carrying values at the date of the acquisition.