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3. Revenue Recognition | 12 Months Ended
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Dec. 31, 2018
Revenue Recognition [Abstract] |
Revenue Recognition | Sales of products for the years ended December 31, 2018, and 2017, were as follows:
|  | Fiscal Year Ended |
|  | December 31, |
|  | 2018 |  |  | 2017 |
Antimony |  | $ | 6,113,014 |  |  | $ | 7,588,470 |
Zeolite |  |  | 2,666,944 |  |  |  | 2,266,636 |
Precious metals |  |  | 254,445 |  |  |  | 374,872 |
|  | $ | 9,034,403 |  |  | $ | 10,229,978 |
The following is sales information by geographic area based on the location of customers for the years ended December 31, 2018, and 2017.
|  | Fiscal Year Ended |
|  | December 31, |
|  | 2018 |  |  | 2017 |
United States |  | $ | 8,242,141 |  |  | $ | 9,510,211 |
Canada |  |  | 792,262 |  |  |  | 719,767 |
|  | $ | 9,034,403 |  |  | $ | 10,229,978 |
Sales of products to significant customers were as follows for the years ended December 31, 2018, and 2017:
Sales to |  | For the Year Ended |
Largest Customers |  | December 31, 2018 |  |  | December 31, 2017 |
Mexichem Specialty Compounds Inc. |  | $ | 2,698,770 |  |  | $ | 3,335,046 |
East Penn Manufacturing Inc |  |  | - |  |  |  | 512,621 |
Kohler Corporation |  |  | 1,441,197 |  |  |  | 1,928,692 |
Ampacet |  |  | 538,922 |  |  |  | - |
|  | $ | 4,678,889 |  |  | $ | 5,776,359 |
% of Total Revenues |  |  | 51.79 | % |  |  | 56.50 | %
Accounts receivable from largest customers were as follows for December 31, 2018, and 2017:
Largest |  |  |  |  |  |
Accounts Receivable |  | December 31, 2018 |  |  | December 31, 2017 |
Nutreco Canada Inc. |  |  |  |  | $ | 25,657 |
DanaMart |  | $ | 143,890 |  |  | $ | - |
Teck American Inc |  |  | - |  |  |  | 241,267 |
Axens North America Inc. |  |  | 34,912 |  |  |  | - |
Earth Innovations Inc. |  |  | 35,967 |  |  |  | - |
Ralco Mix Products |  |  | - |  |  |  | 16,000 |
|  | $ | 214,769 |  |  | $ | 282,924 |
% of Total Receivables |  |  | 49.00 | % |  |  | 78.10 | %
The Company’s trade accounts receivable balance related to contracts with customers was $438,391 at December 31, 2018 and $362,579 at December 31, 2017.

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