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RETAINED INTEREST IN PURCHASED ACCOUNTS RECEIVABLE - Retained interest in purchased accounts receivable (Details) (USD $)
Mar. 31, 2013
Dec. 31, 2012
Mar. 31, 2012
Dec. 31, 2011
Loans, Notes, Trade and Other Receivables Disclosure [Abstract]        
Purchased invoices $ 9,076,705 $ 8,921,203    
Purchase order advances 90,000 21,156    
Reserve account (1,568,322) (1,842,447)    
Allowance for uncollectible invoices (80,449) (80,449) (17,500) (17,500)
Retained interest in purchased accounts receivable, net $ 7,517,934 $ 7,019,463