Note 15 - Segmented Information - Operating Results by Geographic Segments (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jan. 31, 2021	Jan. 31, 2020	Jan. 31, 2021	Jan. 31, 2020
Mineral Property Expenditures	$ 961,257	$ 1,323,323	$ 1,663,018	$ 2,846,774
General and administrative	2,464,703	2,394,794	5,050,392	4,709,964
Depreciation, amortization and accretion	97,598	81,752	196,778	158,138
Loss from operations	(3,523,558)	(3,799,869)	(6,910,188)	(7,714,876)
Other income (expenses)	61,458	1,909,276	(1,516,265)	780,028
Loss before income taxes	(3,462,100)	(1,890,593)	(8,426,453)	(6,934,848)
United States Texas [Member]
Mineral Property Expenditures	602,513	891,008	1,079,843	2,045,350
General and administrative	1,895,718	1,713,121	4,063,077	3,413,998
Depreciation, amortization and accretion	89,372	72,437	178,744	139,933
Loss from operations	(2,587,603)	(2,676,566)	(5,321,664)	(5,599,281)
Other income (expenses)	(537,622)	(844,506)	(1,417,836)	(1,719,112)
Loss before income taxes	(3,125,225)	(3,521,072)	(6,739,500)	(7,318,393)
United States Arizona [Member]
Mineral Property Expenditures	31,452	21,600	62,476	46,172
General and administrative	4,105	3,439	7,825	6,828
Depreciation, amortization and accretion
Loss from operations	(35,557)	(25,039)	(70,301)	(53,000)
Other income (expenses)	(4,768)	(4,768)	(9,535)	(9,535)
Loss before income taxes	(40,325)	(29,807)	(79,836)	(62,535)
United States Wyoming [Member]
Mineral Property Expenditures	169,576	144,182	270,066	292,225
General and administrative	20,249	20,478	37,719	55,191
Depreciation, amortization and accretion	3,719	3,720	7,438	7,437
Loss from operations	(193,544)	(168,380)	(315,223)	(354,853)
Other income (expenses)	(5,766)	700	(5,566)	700
Loss before income taxes	(199,310)	(167,680)	(320,789)	(354,153)
United States Other States [Member]
Mineral Property Expenditures	16,336	16,614	36,405	36,725
General and administrative	345	410	718	1,062
Depreciation, amortization and accretion		249		498
Loss from operations	(16,681)	(17,273)	(37,123)	(38,285)
Other income (expenses)
Loss before income taxes	(16,681)	(17,273)	(37,123)	(38,285)
CANADA
Mineral Property Expenditures	4,779		7,571
General and administrative	533,421	634,315	918,629	1,188,021
Depreciation, amortization and accretion	4,972	2,465	9,280	5,054
Loss from operations	(543,172)	(636,780)	(935,480)	(1,193,075)
Other income (expenses)	609,666	2,756,714	(88,329)	2,505,298
Loss before income taxes	66,494	2,119,934	(1,023,809)	1,312,223
PARAGUAY
Mineral Property Expenditures	136,601	249,919	206,657	426,302
General and administrative	10,865	23,031	22,424	44,864
Depreciation, amortization and accretion	(465)	2,881	1,316	5,216
Loss from operations	(147,001)	(275,831)	(230,397)	(476,382)
Other income (expenses)	(52)	1,136	5,001	2,677
Loss before income taxes	$ (147,053)	$ (274,695)	$ (225,396)	$ (473,705)