Note 14 - Segmented Information - Operating Results by Geographic Segments (Details) - USD ($)	3 Months Ended
	Oct. 31, 2021	Oct. 31, 2020
Mineral Property Expenditures	$ 1,656,516	$ 701,761
General and administrative	3,116,711	2,585,689
Depreciation, amortization and accretion	98,440	99,180
Loss from operations	(4,871,667)	(3,386,630)
Other income (expenses)	2,796,797	(1,577,723)
Loss before income taxes	(2,074,870)	(4,964,353)
United States Texas [Member]
Mineral Property Expenditures	1,152,077	477,330
General and administrative	2,601,809	2,167,359
Depreciation, amortization and accretion	89,600	89,372
Loss from operations	(3,843,486)	(2,734,061)
Other income (expenses)	26,829	(880,214)
Loss before income taxes	(3,816,657)	(3,614,275)
United States Arizona [Member]
Mineral Property Expenditures	29,575	31,024
General and administrative	3,720	3,720
Depreciation, amortization and accretion	0	0
Loss from operations	(33,295)	(34,744)
Other income (expenses)	(4,767)	(4,767)
Loss before income taxes	(38,062)	(39,511)
United States Wyoming [Member]
Mineral Property Expenditures	199,819	100,490
General and administrative	21,395	17,470
Depreciation, amortization and accretion	3,719	3,719
Loss from operations	(224,933)	(121,679)
Other income (expenses)	200	200
Loss before income taxes	(224,733)	(121,479)
United States Other States [Member]
Mineral Property Expenditures	20,424	20,069
General and administrative	345	373
Depreciation, amortization and accretion	0	0
Loss from operations	(20,769)	(20,442)
Other income (expenses)	0	0
Loss before income taxes	(20,769)	(20,442)
CANADA
Mineral Property Expenditures	2,971	2,792
General and administrative	479,752	385,208
Depreciation, amortization and accretion	3,698	4,308
Loss from operations	(486,421)	(392,308)
Other income (expenses)	2,773,732	(697,995)
Loss before income taxes	2,287,311	(1,090,303)
PARAGUAY
Mineral Property Expenditures	251,650	70,056
General and administrative	9,690	11,559
Depreciation, amortization and accretion	1,423	1,781
Loss from operations	(262,763)	(83,396)
Other income (expenses)	803	5,053
Loss before income taxes	$ (261,960)	$ (78,343)