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4. Revenue Recognition (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Revenues $ 1,787,934 $ 2,091,725 $ 6,516,582 $ 6,781,001
Antimony        
Revenues 1,080,871 1,366,540 4,294,281 4,540,873
Zeolite        
Revenues 651,563 653,365 2,081,751 2,026,605
Precious Metals        
Revenues 55,500 71,820 140,550 213,523
United States        
Revenues 1,570,364 1,876,218 5,498,640 6,151,068
Canada        
Revenues 217,570 215,507 544,350 629,933
Mexico        
Revenues $ 0 $ 0 $ 473,592 $ 0