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Accrued Liabilities (Schedule of Accrued Liabilities) (Details) (USD $)
Dec. 31, 2012
Dec. 31, 2011
Other Liabilities, Current [Abstract]    
Rebates, product returns, administrative fees and service fees $ 3,371,863 $ 3,216,622
Employee wages and benefits 1,473,983 1,071,691
Other current liabilities 418,960 798,087
Total accrued liabilities $ 5,264,806 $ 5,086,400