Note 17 - Segmented Information - Long-term Assets by Geographic Segments (Details) - USD ($)	Jul. 31, 2019	Jul. 31, 2018	Jul. 31, 2017
Mineral Rights and Properties	$ 63,536,895	$ 71,122,576
Property, Plant and Equipment	7,042,359	7,101,552
Restricted Cash	1,821,392	1,789,899	$ 1,706,028
Equity-Accounted Investment	8,680,449	693,502	$ 151,676
Other Long-Term Assets	249,214	563,052
Total Long-Term Assets	81,330,309	81,270,581
Reclamation Deposits		1,789,899
United States Texas [Member]
Mineral Rights and Properties	12,433,203	12,729,697
Property, Plant and Equipment	6,333,950	6,362,608
Restricted Cash	1,732,419
Equity-Accounted Investment
Other Long-Term Assets	221,214	416,519
Total Long-Term Assets	20,720,786	21,209,750
Reclamation Deposits		1,700,926
United States Arizona [Member]
Mineral Rights and Properties	4,427,477	11,069,018
Property, Plant and Equipment
Restricted Cash	15,000
Equity-Accounted Investment
Other Long-Term Assets
Total Long-Term Assets	4,442,477	11,084,018
Reclamation Deposits		15,000
United States Wyoming [Member]
Mineral Rights and Properties	31,527,870	31,527,870
Property, Plant and Equipment	342,515	357,392
Restricted Cash	73,973
Equity-Accounted Investment
Other Long-Term Assets	28,000	146,533
Total Long-Term Assets	31,972,358	32,105,768
Reclamation Deposits		73,973
United States Other States [Member]
Mineral Rights and Properties	87,822	735,468
Property, Plant and Equipment
Restricted Cash
Equity-Accounted Investment
Other Long-Term Assets
Total Long-Term Assets	87,822	735,468
Reclamation Deposits
CANADA
Mineral Rights and Properties	546,938	546,938
Property, Plant and Equipment	14,223	25,889
Restricted Cash
Equity-Accounted Investment	8,680,449	693,502
Other Long-Term Assets
Total Long-Term Assets	9,241,610	1,266,329
Reclamation Deposits
PARAGUAY
Mineral Rights and Properties	14,513,585	14,513,585
Property, Plant and Equipment	351,671	355,663
Restricted Cash
Equity-Accounted Investment
Other Long-Term Assets
Total Long-Term Assets	$ 14,865,256	14,869,248
Reclamation Deposits