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Major Customers (Details Textual) - USD ($)
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Customer One [Member]    
Revenue, Major Customer [Line Items]    
Concentration Risk, Percentage 28.00% 26.90%
Accounts Receivable, Gross $ 5,512,000 $ 2,685,000
Customer Two [Member]    
Revenue, Major Customer [Line Items]    
Concentration Risk, Percentage 24.60% 15.40%
Accounts Receivable, Gross $ 2,842,000 $ 2,849,000