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Other Accrued Liabilities (Details) - USD ($) | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Payables and Accruals [Abstract] |  |
Customer rebates | $ 2,789,003 | $ 3,168,756
Remediation liability | 57,197 | 80,947
Pension liability | 205,071 | 359,216
Other | 2,619,819 | 2,052,074
Total accrued liabilities | $ 5,671,090 | $ 5,660,993

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