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Summary of Significant Accounting Policies (Details Textual)
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2018
USD ($)
Customer / Customers
Sep. 30, 2017
Customer / Customers
Sep. 30, 2018
USD ($)
Customer / Customers
Sep. 30, 2017
USD ($)
Customer / Customers
Dec. 31, 2017
USD ($)
Customer / Customers
Summary of Significant Accounting Policies (Textual)          
Stock-based compensation     $ 308,000 $ 9,000  
Percentage of inventory valuation 50.00%   50.00%    
Goodwill $ 272,000   $ 272,000   $ 272,000
Loss gain on assets held for sale     (930,000) 1,563,000
ECC [Member]          
Summary of Significant Accounting Policies (Textual)          
Goodwill 109,000   109,000   109,000
NTW [Member]          
Summary of Significant Accounting Policies (Textual)          
Goodwill $ 163,000   $ 163,000   $ 163,000
Total Sales [Member]          
Summary of Significant Accounting Policies (Textual)          
Concentration Risks 67.40% 72.10% 69.10% 68.80%  
Number of Customers | Customer / Customers 3 3 3 3  
Accounts receivable [Member]          
Summary of Significant Accounting Policies (Textual)          
Concentration Risks     67.90%   68.70%
Number of Customers | Customer / Customers     3   3