Note 15 - Segmented Information - Long-term Assets by Geographic Segments (Details) - USD ($)	Jan. 31, 2021	Jul. 31, 2020	Jan. 31, 2020	Jul. 31, 2019
Mineral Rights and Properties	$ 63,734,753	$ 63,655,503
Property, Plant and Equipment	7,446,299	7,019,817
Restricted Cash	1,839,300	1,839,216	$ 1,834,746	$ 1,821,392
Equity-Accounted Investment	11,961,434	11,515,327
Other Non-Current Assets	722,963	769,875
Total Long-Term Assets	85,704,749	84,799,738
United States Texas [Member]
Mineral Rights and Properties	12,421,911	12,422,661
Property, Plant and Equipment	6,723,072	6,299,786
Restricted Cash	1,750,327	1,750,243
Equity-Accounted Investment
Other Non-Current Assets	620,996	703,312
Total Long-Term Assets	21,516,306	21,176,002
United States Arizona [Member]
Mineral Rights and Properties	4,577,477	4,527,477
Property, Plant and Equipment
Restricted Cash	15,000	15,000
Equity-Accounted Investment
Other Non-Current Assets
Total Long-Term Assets	4,592,477	4,542,477
United States Wyoming [Member]
Mineral Rights and Properties	31,527,870	31,527,870
Property, Plant and Equipment	320,201	327,639
Restricted Cash	73,973	73,973
Equity-Accounted Investment
Other Non-Current Assets	19,000	22,000
Total Long-Term Assets	31,941,044	31,951,482
United States Other States [Member]
Mineral Rights and Properties	146,971	116,971
Property, Plant and Equipment
Restricted Cash
Equity-Accounted Investment
Other Non-Current Assets
Total Long-Term Assets	146,971	116,971
CANADA
Mineral Rights and Properties	546,938	546,938
Property, Plant and Equipment	41,626	29,677
Restricted Cash
Equity-Accounted Investment	11,961,434	11,515,327
Other Non-Current Assets	82,967	44,563
Total Long-Term Assets	12,632,965	12,136,505
PARAGUAY
Mineral Rights and Properties	14,513,586	14,513,586
Property, Plant and Equipment	361,400	362,715
Restricted Cash
Equity-Accounted Investment
Other Non-Current Assets
Total Long-Term Assets	$ 14,874,986	$ 14,876,301