Note 14 - Segmented Information - Operating Results by Geographic Segments (Details) - USD ($)	3 Months Ended
	Oct. 31, 2020	Oct. 31, 2019
Mineral Property Expenditures	$ 701,761	$ 1,523,451
General and administrative	2,585,689	2,315,170
Depreciation, amortization and accretion	99,180	76,386
Loss from operations	(3,386,630)	(3,915,007)
Other income (expenses)	(1,577,723)	(1,129,248)
Loss before income taxes	(4,964,353)	(5,044,255)
United States Texas [Member]
Mineral Property Expenditures	477,330	1,154,342
General and administrative	2,167,359	1,700,877
Depreciation, amortization and accretion	89,372	67,496
Loss from operations	(2,734,061)	(2,922,715)
Other income (expenses)	(880,214)	(1,215,203)
Loss before income taxes	(3,614,275)	(4,137,918)
United States Arizona [Member]
Mineral Property Expenditures	31,024	24,572
General and administrative	3,720	3,389
Depreciation, amortization and accretion
Loss from operations	(34,744)	(27,961)
Other income (expenses)	(4,767)	(4,767)
Loss before income taxes	(39,511)	(32,728)
United States Wyoming [Member]
Mineral Property Expenditures	100,490	148,043
General and administrative	17,470	34,713
Depreciation, amortization and accretion	3,719	3,717
Loss from operations	(121,679)	(186,473)
Other income (expenses)	200
Loss before income taxes	(121,479)	(186,473)
United States Other States [Member]
Mineral Property Expenditures	20,069	20,111
General and administrative	373	652
Depreciation, amortization and accretion		249
Loss from operations	(20,442)	(21,012)
Other income (expenses)
Loss before income taxes	(20,442)	(21,012)
CANADA
Mineral Property Expenditures	2,792
General and administrative	385,208	553,706
Depreciation, amortization and accretion	4,308	2,589
Loss from operations	(392,308)	(556,295)
Other income (expenses)	(697,995)	89,181
Loss before income taxes	(1,090,303)	(467,114)
PARAGUAY
Mineral Property Expenditures	70,056	176,383
General and administrative	11,559	21,833
Depreciation, amortization and accretion	1,781	2,335
Loss from operations	(83,396)	(200,551)
Other income (expenses)	5,053	1,541
Loss before income taxes	$ (78,343)	$ (199,010)