Note 5 - Property, Plant and Equipment - Summary of Property, Plant and Equipment (Details) - USD ($)	Apr. 30, 2019	Jul. 31, 2018
Cost	$ 12,787,886	$ 12,897,160
Accumulated Depreciation	(5,666,058)	(5,795,608)
Net Book Value	7,121,828	7,101,552
Hobson Processing Facility [Member]
Cost	6,819,088	6,819,088
Accumulated Depreciation	(773,933)	(773,933)
Net Book Value	6,045,155	6,045,155
Mining Equipment [Member]
Cost	2,467,557	2,438,681
Accumulated Depreciation	(2,396,991)	(2,412,277)
Net Book Value	70,566	26,404
Logging Equipment and Vehicles [Member]
Cost	1,851,883	1,971,742
Accumulated Depreciation	(1,742,816)	(1,850,306)
Net Book Value	109,067	121,436
Computer Equipment [Member]
Cost	589,051	607,342
Accumulated Depreciation	(559,229)	(577,584)
Net Book Value	29,822	29,758
Furniture and Fixtures [Member]
Cost	170,701	170,701
Accumulated Depreciation	(169,238)	(168,814)
Net Book Value	1,463	1,887
Land and Building [Member]
Cost	889,606	889,606
Accumulated Depreciation	(23,851)	(12,694)
Net Book Value	$ 865,755	$ 876,912