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Other Accrued Liabilities (Details) (USD $) | Dec. 31, 2012 | Dec. 31, 2011
--- | --- | ---
Payables and Accruals [Abstract] |  |
Customer rebates | $ 3,404,720 | $ 2,747,352
Remediation liability | 123,587 | 239,016
Pension liability | 900,291 | 1,012,786
Other | 1,732,940 | 943,676
Total accrued liabilities | $ 6,161,538 | $ 4,942,830

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