Note 16 - Sales and Service Revenue and Cost of Sales and Services (Details Textual) GT in Thousands, $ in Thousands	12 Months Ended
	Jul. 31, 2022 USD ($) lb	Jul. 31, 2021 USD ($) GT	Jul. 31, 2020 USD ($) GT
Revenues, Total	$ 23,161	$ 0	$ 0
Sale of Inventory [Member]
Revenues, Total	$ 22,946	$ 0	$ 0
Revenue Benchmark [Member] | Customer Concentration Risk [Member] | Sale of Inventory [Member] | Customer A [Member]
Concentration Risk, Percentage	57.00%
Revenue Benchmark [Member] | Customer Concentration Risk [Member] | Sale of Inventory [Member] | Customer B [Member]
Concentration Risk, Percentage	43.00%
Uranium Inventory [Member]
Revenues, Total	$ 22,946
Inventory, Sold During Period, Mass (Pound) | lb	500,000
Toll Processing Services [Member]
Revenues, Total	$ 215
Inventory, Sold During Period, Mass (Pound) | GT		0	0