Note 14 - Segmented Information - Long-term Assets by Geographic Segments (Details) - USD ($)	Oct. 31, 2020	Jul. 31, 2020	Oct. 31, 2019	Jul. 31, 2019
Mineral Rights and Properties	$ 63,655,128	$ 63,655,503
Property, Plant and Equipment	6,974,999	7,019,817
Restricted Cash	1,839,260	1,839,216	$ 1,828,921	$ 1,821,392
Equity-Accounted Investment	10,874,483	11,515,327
Other Non-Current Assets	726,351	769,875
Total Long-Term Assets	84,070,221	84,799,738
United States Texas [Member]
Mineral Rights and Properties	12,422,286	12,422,661
Property, Plant and Equipment	6,261,873	6,299,786
Restricted Cash	1,750,287	1,750,243
Equity-Accounted Investment
Other Non-Current Assets	677,910	703,312
Total Long-Term Assets	21,112,356	21,176,002
United States Arizona [Member]
Mineral Rights and Properties	4,527,477	4,527,477
Property, Plant and Equipment
Restricted Cash	15,000	15,000
Equity-Accounted Investment
Other Non-Current Assets
Total Long-Term Assets	4,542,477	4,542,477
United States Wyoming [Member]
Mineral Rights and Properties	31,527,870	31,527,870
Property, Plant and Equipment	323,920	327,639
Restricted Cash	73,973	73,973
Equity-Accounted Investment
Other Non-Current Assets	20,500	22,000
Total Long-Term Assets	31,946,263	31,951,482
United States Other States [Member]
Mineral Rights and Properties	116,971	116,971
Property, Plant and Equipment
Restricted Cash
Equity-Accounted Investment
Other Non-Current Assets
Total Long-Term Assets	116,971	116,971
CANADA
Mineral Rights and Properties	546,938	546,938
Property, Plant and Equipment	28,272	29,677
Restricted Cash
Equity-Accounted Investment	10,874,483	11,515,327
Other Non-Current Assets	27,941	44,563
Total Long-Term Assets	11,477,634	12,136,505
PARAGUAY
Mineral Rights and Properties	14,513,586	14,513,586
Property, Plant and Equipment	360,934	362,715
Restricted Cash
Equity-Accounted Investment
Other Non-Current Assets
Total Long-Term Assets	$ 14,874,520	$ 14,876,301