Note 14 - Segmented Information - Long-term Assets by Geographic Segments (Details) - USD ($)	Jan. 31, 2020	Jul. 31, 2019	Jan. 31, 2019	Jul. 31, 2018	Jul. 31, 2017
Mineral Rights and Properties	$ 63,606,605	$ 63,536,895
Property, Plant and Equipment	7,021,321	7,042,359
Restricted Cash	1,834,746	1,821,392	$ 1,804,328	$ 1,821,392	$ 1,789,899
Equity-Accounted Investment	10,994,683	8,680,449
Other Long-Term Assets	988,712	249,214
Total Long-Term Assets	84,446,067	81,330,309
United States Texas [Member]
Mineral Rights and Properties	12,423,411	12,433,203
Property, Plant and Equipment	6,310,027	6,333,950
Restricted Cash	1,745,773	1,732,419
Equity-Accounted Investment
Other Long-Term Assets	836,369	221,214
Total Long-Term Assets	21,315,580	20,720,786
United States Arizona [Member]
Mineral Rights and Properties	4,477,477	4,427,477
Property, Plant and Equipment
Restricted Cash	15,000	15,000
Equity-Accounted Investment
Other Long-Term Assets
Total Long-Term Assets	4,492,477	4,442,477
United States Wyoming [Member]
Mineral Rights and Properties	31,527,870	31,527,870
Property, Plant and Equipment	335,078	342,515
Restricted Cash	73,973	73,973
Equity-Accounted Investment
Other Long-Term Assets	25,000	28,000
Total Long-Term Assets	31,961,921	31,972,358
United States Other States [Member]
Mineral Rights and Properties	117,324	87,822
Property, Plant and Equipment
Restricted Cash
Equity-Accounted Investment
Other Long-Term Assets
Total Long-Term Assets	117,324	87,822
CANADA
Mineral Rights and Properties	546,938	546,938
Property, Plant and Equipment	9,169	14,223
Restricted Cash
Equity-Accounted Investment	10,994,683	8,680,449
Other Long-Term Assets	127,343
Total Long-Term Assets	11,678,133	9,241,610
PARAGUAY
Mineral Rights and Properties	14,513,585	14,513,585
Property, Plant and Equipment	367,047	351,671
Restricted Cash
Equity-Accounted Investment
Other Long-Term Assets
Total Long-Term Assets	$ 14,880,632	$ 14,865,256