Note 14 - Segmented Information - Operating Results by Geographic Segments (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jan. 31, 2019	Jan. 31, 2018	Jan. 31, 2019	Jan. 31, 2018
Costs and Expenses:
Mineral Property Expenditures	$ 899,217	$ 980,215	$ 1,765,460	$ 2,656,915
General and administrative	2,183,463	2,864,165	4,442,398	5,119,127
Depreciation, amortization and accretion	84,807	89,437	173,583	179,772
	3,167,487	3,933,817	6,381,441	7,955,814
Loss from operations	(3,167,487)	(3,933,817)	(6,381,441)	(7,955,814)
Other income (expenses)	811,015	(667,093)	568,375	(1,210,124)
Loss before income taxes	(2,356,472)	(4,600,910)	(5,813,066)	(9,165,938)
COSTS AND EXPENSES
Mineral Property Expenditures	899,217	980,215	1,765,460	2,656,915
General and administrative	2,183,463	2,864,165	4,442,398	5,119,127
Depreciation, amortization and accretion	84,807	89,437	173,583	179,772
	3,167,487	3,933,817	6,381,441	7,955,814
Loss from operations	(3,167,487)	(3,933,817)	(6,381,441)	(7,955,814)
Other income (expenses)	811,015	(667,093)	568,375	(1,210,124)
Loss before income taxes	(2,356,472)	(4,600,910)	(5,813,066)	(9,165,938)
United States Texas [Member]
Costs and Expenses:
Mineral Property Expenditures	575,666	467,284	1,154,488	1,183,908
General and administrative	1,508,298	1,706,667	3,070,055	3,160,538
Depreciation, amortization and accretion	76,327	81,998	156,412	167,784
	2,160,291	2,255,949	4,380,955	4,512,230
Loss from operations	(2,160,291)	(2,255,949)	(4,380,955)	(4,512,230)
Other income (expenses)	(658,534)	(551,416)	(1,286,117)	(1,211,396)
Loss before income taxes	(2,818,825)	(2,807,365)	(5,667,072)	(5,723,626)
COSTS AND EXPENSES
Mineral Property Expenditures	575,666	467,284	1,154,488	1,183,908
General and administrative	1,508,298	1,706,667	3,070,055	3,160,538
Depreciation, amortization and accretion	76,327	81,998	156,412	167,784
	2,160,291	2,255,949	4,380,955	4,512,230
Loss from operations	(2,160,291)	(2,255,949)	(4,380,955)	(4,512,230)
Other income (expenses)	(658,534)	(551,416)	(1,286,117)	(1,211,396)
Loss before income taxes	(2,818,825)	(2,807,365)	(5,667,072)	(5,723,626)
United States Arizona [Member]
Costs and Expenses:
Mineral Property Expenditures	22,866	22,822	52,987	46,562
General and administrative	3,482	3,710	6,871	7,099
Depreciation, amortization and accretion
	26,348	26,532	59,858	53,661
Loss from operations	(26,348)	(26,532)	(59,858)	(53,661)
Other income (expenses)	(4,768)	(4,768)	(9,535)	(9,535)
Loss before income taxes	(31,116)	(31,300)	(69,393)	(63,196)
COSTS AND EXPENSES
Mineral Property Expenditures	22,866	22,822	52,987	46,562
General and administrative	3,482	3,710	6,871	7,099
Depreciation, amortization and accretion
	26,348	26,532	59,858	53,661
Loss from operations	(26,348)	(26,532)	(59,858)	(53,661)
Other income (expenses)	(4,768)	(4,768)	(9,535)	(9,535)
Loss before income taxes	(31,116)	(31,300)	(69,393)	(63,196)
United States Wyoming [Member]
Costs and Expenses:
Mineral Property Expenditures	147,418	245,825	295,294	969,216
General and administrative	23,132	491,361	54,502	523,793
Depreciation, amortization and accretion	3,720	3,796	7,439	5,409
	174,270	740,982	357,235	1,498,418
Loss from operations	(174,270)	(740,982)	(357,235)	(1,498,418)
Other income (expenses)	100	709	400	1,490
Loss before income taxes	(174,170)	(740,273)	(356,835)	(1,496,928)
COSTS AND EXPENSES
Mineral Property Expenditures	147,418	245,825	295,294	969,216
General and administrative	23,132	491,361	54,502	523,793
Depreciation, amortization and accretion	3,720	3,796	7,439	5,409
	174,270	740,982	357,235	1,498,418
Loss from operations	(174,270)	(740,982)	(357,235)	(1,498,418)
Other income (expenses)	100	709	400	1,490
Loss before income taxes	(174,170)	(740,273)	(356,835)	(1,496,928)
United States Other States [Member]
Costs and Expenses:
Mineral Property Expenditures	15,345	16,189	39,220	36,359
General and administrative	1,687	1,122	1,948	2,244
Depreciation, amortization and accretion	249	249	498	498
	17,281	17,560	41,666	39,101
Loss from operations	(17,281)	(17,560)	(41,666)	(39,101)
Other income (expenses)	1,578,864		1,578,864
Loss before income taxes	1,561,583	(17,560)	1,537,198	(39,101)
COSTS AND EXPENSES
Mineral Property Expenditures	15,345	16,189	39,220	36,359
General and administrative	1,687	1,122	1,948	2,244
Depreciation, amortization and accretion	249	249	498	498
	17,281	17,560	41,666	39,101
Loss from operations	(17,281)	(17,560)	(41,666)	(39,101)
Other income (expenses)	1,578,864		1,578,864
Loss before income taxes	1,561,583	(17,560)	1,537,198	(39,101)
CANADA
Costs and Expenses:
Mineral Property Expenditures	135		15,723
General and administrative	613,571	662,442	1,225,041	1,358,369
Depreciation, amortization and accretion	2,589	2,035	6,487	4,117
	616,295	664,477	1,247,251	1,362,486
Loss from operations	(616,295)	(664,477)	(1,247,251)	(1,362,486)
Other income (expenses)	(105,837)	(108,789)	282,032
Loss before income taxes	(722,132)	(773,266)	(965,219)	(1,362,486)
COSTS AND EXPENSES
Mineral Property Expenditures	135		15,723
General and administrative	613,571	662,442	1,225,041	1,358,369
Depreciation, amortization and accretion	2,589	2,035	6,487	4,117
	616,295	664,477	1,247,251	1,362,486
Loss from operations	(616,295)	(664,477)	(1,247,251)	(1,362,486)
Other income (expenses)	(105,837)	(108,789)	282,032
Loss before income taxes	(722,132)	(773,266)	(965,219)	(1,362,486)
PARAGUAY
Costs and Expenses:
Mineral Property Expenditures	137,787	228,095	207,748	420,870
General and administrative	33,293		83,981	67,084
Depreciation, amortization and accretion	1,922	1,359	2,747	1,964
	173,002	228,317	294,476	489,918
Loss from operations	(173,002)	(228,317)	(294,476)	(489,918)
Other income (expenses)	1,190	(2,829)	2,731	9,317
Loss before income taxes	(171,812)	(231,146)	(291,745)	(480,601)
COSTS AND EXPENSES
Mineral Property Expenditures	137,787	228,095	207,748	420,870
General and administrative	33,293		83,981	67,084
General and administrative		(1,137)
Depreciation, amortization and accretion	1,922	1,359	2,747	1,964
	173,002	228,317	294,476	489,918
Loss from operations	(173,002)	(228,317)	(294,476)	(489,918)
Other income (expenses)	1,190	(2,829)	2,731	9,317
Loss before income taxes	$ (171,812)	$ (231,146)	$ (291,745)	$ (480,601)