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