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Retained Interest in Purchased Accounts Receivable - Retained interest in purchased accounts receivable (Details) (USD $)
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Retained Interest In Purchased Accounts Receivable [Abstract]      
Purchased invoices $ 6,085,940 $ 8,921,203  
Purchase order advances 365,394 21,156  
Reserve account (1,481,996) (1,842,447)  
Allowance for uncollectible invoices (3,000) (80,449) (17,500)
Retained interest in purchased accounts receivable, net $ 4,966,338 $ 7,019,463