Note 7 - Property, Plant and Equipment - Summary of Property, Plant and Equipment (Details) - USD ($) $ in Thousands	Oct. 31, 2022	Jul. 31, 2022	Oct. 31, 2021
Net Book Value	$ 20,116	$ 20,234
Plant and Processing Facilities [Member]
Cost	19,099		$ 18,964
Accumulated Depreciation	(1,478)		(1,306)
Net Book Value	17,621		17,658
Mining Equipment [Member]
Cost	2,794		2,777
Accumulated Depreciation	(2,412)		(2,382)
Net Book Value	382		395
Logging Equipment and Vehicles [Member]
Cost	2,657		2,666
Accumulated Depreciation	(1,896)		(1,851)
Net Book Value	761		815
Computer Equipment [Member]
Cost	360		360
Accumulated Depreciation	(322)		(313)
Net Book Value	38		47
Furniture and Fixtures [Member]
Cost	190		190
Accumulated Depreciation	(178)		(177)
Net Book Value	12		13
Buildings [Member]
Cost	298		298
Accumulated Depreciation	(76)		(72)
Net Book Value	222		226
Land [Member]
Cost	1,080		1,080
Accumulated Depreciation	0		0
Net Book Value	1,080		1,080
Property, Plant And Equipment, Excluding Mineral Properties and Rights [Member]
Cost	26,478		26,335
Accumulated Depreciation	(6,362)		(6,101)
Net Book Value	$ 20,116		$ 20,234