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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Enterprise Wide Disclosures and Foreign Currency Transactions (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016
Enterprise-Wide Disclosures |  |
Percentage of sales (as a percent) | 10.00% | 10.00%
Total Net Sales | $ 112,334,749 | $ 116,621,719
Property and equipment, net | 10,175,533 | 10,330,834
Other assets | 4,121,801 | 5,152,944
Foreign Currency Transactions |  |
Foreign currency translation adjustment |  | 56,340
Foreign currency translation loss | 100,785 | 44,445
Net foreign currency transaction gains (losses) | (192,187) | (82,000)
United States |  |
Enterprise-Wide Disclosures |  |
Property and equipment, net | 8,712,902 | 8,731,205
Other assets | 4,114,075 | 5,145,218
Mexico |  |
Enterprise-Wide Disclosures |  |
Property and equipment, net | 1,003,040 | 1,238,087
Other assets | 7,726 | 7,726
China |  |
Enterprise-Wide Disclosures |  |
Property and equipment, net | $ 459,591 | $ 361,542
Export sales | Domestic |  |
Enterprise-Wide Disclosures |  |
Percentage of sales (as a percent) | 4.50% | 8.00%
Aerospace and Defense |  |
Enterprise-Wide Disclosures |  |
Total Net Sales | $ 15,682,635 | $ 16,114,759
Medical |  |
Enterprise-Wide Disclosures |  |
Total Net Sales | 51,448,581 | 53,835,916
Industrial |  |
Enterprise-Wide Disclosures |  |
Total Net Sales | $ 45,203,533 | $ 46,671,044

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