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Long term obligations (Details Textual) (USD $)
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Contractual Obligation   $ 470,000  
Repayments Of Long-Term Loans From Vendors 940,000    
Amortization $ 800,000 $ 600,000 $ 600,000