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Note 14 - Segmented Information - Long-term Assets by Geographic Segments (Details) - USD ($)
Oct. 31, 2019
Jul. 31, 2019
Oct. 31, 2018
Jul. 31, 2018
Jul. 31, 2017
Mineral Rights and Properties $ 63,534,003 $ 63,536,895      
Property, Plant and Equipment 7,044,000 7,042,359      
Restricted Cash 1,828,921 1,821,392 $ 1,796,529 $ 1,821,392 $ 1,789,899
Equity-Accounted Investment 8,329,958 8,680,449      
Other Long-Term Assets 1,070,450 249,214      
Total Long-Term Assets 81,807,332 81,330,309      
United States Texas [Member]          
Mineral Rights and Properties 12,430,560 12,433,203      
Property, Plant and Equipment 6,324,336 6,333,950      
Restricted Cash 1,739,948 1,732,419      
Equity-Accounted Investment      
Other Long-Term Assets 925,041 221,214      
Total Long-Term Assets 21,419,885 20,720,786      
United States Arizona [Member]          
Mineral Rights and Properties 4,427,477 4,427,477      
Property, Plant and Equipment      
Restricted Cash 15,000 15,000      
Equity-Accounted Investment      
Other Long-Term Assets      
Total Long-Term Assets 4,442,477 4,442,477      
United States Wyoming [Member]          
Mineral Rights and Properties 31,527,870 31,527,870      
Property, Plant and Equipment 338,798 342,515      
Restricted Cash 73,973 73,973      
Equity-Accounted Investment      
Other Long-Term Assets 26,500 28,000      
Total Long-Term Assets 31,967,141 31,972,358      
United States Other States [Member]          
Mineral Rights and Properties 87,573 87,822      
Property, Plant and Equipment      
Restricted Cash      
Equity-Accounted Investment      
Other Long-Term Assets      
Total Long-Term Assets 87,573 87,822      
CANADA          
Mineral Rights and Properties 546,938 546,938      
Property, Plant and Equipment 11,634 14,223      
Restricted Cash      
Equity-Accounted Investment 8,329,958 8,680,449      
Other Long-Term Assets 118,909      
Total Long-Term Assets 9,007,439 9,241,610      
PARAGUAY          
Mineral Rights and Properties 14,513,585 14,513,585      
Property, Plant and Equipment 369,232 351,671      
Restricted Cash      
Equity-Accounted Investment      
Other Long-Term Assets      
Total Long-Term Assets $ 14,882,817 $ 14,865,256