Note 16 - Segmented Information - Operating Results by Geographic Segments (Details) - USD ($)	3 Months Ended		9 Months Ended
	Apr. 30, 2021	Apr. 30, 2020	Apr. 30, 2021	Apr. 30, 2020
Mineral Property Expenditures	$ 1,478,754	$ 956,564	$ 3,141,772	$ 3,803,338
General and administrative	3,286,201	2,127,887	8,336,593	6,837,851
Depreciation, amortization and accretion	98,186	74,060	294,964	232,198
Loss from operations	(4,863,141)	(3,158,511)	(11,773,329)	(10,873,387)
Other income (expenses)	272,043	(116,146)	(1,244,222)	663,882
Loss before income taxes	(4,591,098)	(3,274,657)	(13,017,551)	(10,209,505)
United States Texas [Member]
Mineral Property Expenditures	1,010,005	619,892	2,089,848	2,665,242
General and administrative	2,601,113	1,513,764	6,664,190	4,927,762
Depreciation, amortization and accretion	89,415	65,809	268,159	205,742
Loss from operations	(3,700,533)	(2,199,465)	(9,022,197)	(7,798,746)
Other income (expenses)	(613,705)	(826,432)	(2,031,541)	(2,545,544)
Loss before income taxes	(4,314,238)	(3,025,897)	(11,053,738)	(10,344,290)
United States Arizona [Member]
Mineral Property Expenditures	30,996	27,686	93,472	73,858
General and administrative	3,720	3,389	11,545	10,217
Depreciation, amortization and accretion
Loss from operations	(34,716)	(31,075)	(105,017)	(84,075)
Other income (expenses)	(4,611)	(4,663)	(14,146)	(14,198)
Loss before income taxes	(39,327)	(35,738)	(119,163)	(98,273)
United States Wyoming [Member]
Mineral Property Expenditures	215,725	159,087	485,791	451,312
General and administrative	26,513	22,358	64,232	77,549
Depreciation, amortization and accretion	3,719	3,720	11,157	11,157
Loss from operations	(245,957)	(185,165)	(561,180)	(540,018)
Other income (expenses)	(2,770)	995	(8,336)	1,695
Loss before income taxes	(248,727)	(184,170)	(569,516)	(538,323)
United States Other States [Member]
Mineral Property Expenditures	16,335	16,462	52,740	53,187
General and administrative	230	345	948	1,407
Depreciation, amortization and accretion		249		747
Loss from operations	(16,565)	(17,056)	(53,688)	(55,341)
Other income (expenses)
Loss before income taxes	(16,565)	(17,056)	(53,688)	(55,341)
CANADA
Mineral Property Expenditures	92		7,663
General and administrative	645,028	587,015	1,563,657	1,775,036
Depreciation, amortization and accretion	3,858	2,497	13,138	7,551
Loss from operations	(648,978)	(589,512)	(1,584,458)	(1,782,587)
Other income (expenses)	893,129	713,467	804,800	3,218,765
Loss before income taxes	244,151	123,955	(779,658)	1,436,178
PARAGUAY
Mineral Property Expenditures	205,601	133,437	412,258	559,739
General and administrative	9,597	1,016	32,021	45,880
Depreciation, amortization and accretion	1,194	1,785	2,510	7,001
Loss from operations	(216,392)	(136,238)	(446,789)	(612,620)
Other income (expenses)		487	5,001	3,164
Loss before income taxes	$ (216,392)	$ (135,751)	$ (441,788)	$ (609,456)