4. Revenue Recognition (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Revenues	$ 1,585,191	$ 2,272,283	$ 3,328,182	$ 4,728,648
Antimony
Revenues	910,484	1,507,588	2,031,411	3,213,411
Zeolite
Revenues	612,715	704,172	1,430,187	1,430,187
Precious Metals
Revenues	61,992	60,523	124,198	85,050
United States
Revenues	1,436,047	1,819,707	3,002,284	3,928,276
Canada
Revenues	149,144	139,523	325,898	326,780
Mexico
Revenues	$ 0	$ 313,053	$ 0	$ 473,592