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Concentrations (Details Textual)
6 Months Ended 12 Months Ended
Jun. 30, 2014
Supplier Concentration Risk
Jun. 30, 2013
Supplier Concentration Risk
Jun. 30, 2014
Credit Concentration Risk
Dec. 31, 2013
Credit Concentration Risk
Concentration Risk [Line Items]        
Concentration risk percentage 19.00% 21.00% 8.00% 7.00%