Note 17 - Segmented Information - Long-term Assets by Geographic Segments (Details) - USD ($)	Jul. 31, 2020	Jul. 31, 2019	Jul. 31, 2018	Jul. 31, 2017
Mineral Rights and Properties	$ 63,655,503	$ 63,536,895
Property, Plant and Equipment	7,019,817	7,042,359
Restricted Cash	1,839,216	1,821,392	$ 1,789,899
Equity-Accounted Investment	11,515,327	8,680,449	$ 693,502	$ 151,676
Other Non-Current Assets	769,875	249,214
Total Long-Term Assets	84,799,738	81,330,309
United States Texas [Member]
Mineral Rights and Properties	12,422,661	12,433,203
Property, Plant and Equipment	6,299,786	6,333,950
Restricted Cash	1,750,243	1,732,419
Equity-Accounted Investment
Other Non-Current Assets	703,312	221,214
Total Long-Term Assets	21,176,002	20,720,786
United States Arizona [Member]
Mineral Rights and Properties	4,527,477	4,427,477
Property, Plant and Equipment
Restricted Cash	15,000	15,000
Equity-Accounted Investment
Other Non-Current Assets
Total Long-Term Assets	4,542,477	4,442,477
United States Wyoming [Member]
Mineral Rights and Properties	31,527,870	31,527,870
Property, Plant and Equipment	327,639	342,515
Restricted Cash	73,973	73,973
Equity-Accounted Investment
Other Non-Current Assets	22,000	28,000
Total Long-Term Assets	31,951,482	31,972,358
United States Other States [Member]
Mineral Rights and Properties	116,971	87,822
Property, Plant and Equipment
Restricted Cash
Equity-Accounted Investment
Other Non-Current Assets
Total Long-Term Assets	116,971	87,822
CANADA
Mineral Rights and Properties	546,938	546,938
Property, Plant and Equipment	29,677	14,223
Restricted Cash
Equity-Accounted Investment	11,515,327	8,680,449
Other Non-Current Assets	44,563
Total Long-Term Assets	12,136,505	9,241,610
PARAGUAY
Mineral Rights and Properties	14,513,586	14,513,585
Property, Plant and Equipment	362,715	351,671
Restricted Cash
Equity-Accounted Investment
Other Non-Current Assets
Total Long-Term Assets	$ 14,876,301	$ 14,865,256