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Stock-based Compensation (Details Textual) - USD ($)
3 Months Ended 9 Months Ended 12 Months Ended
Jan. 04, 2017
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Dec. 31, 2016
Jun. 30, 2010
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]                
Allocated Share Based Compensation Expense   $ 57,000 $ 58,000 $ 169,000 $ 158,000 $ 108,000    
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized   434,000   434,000        
Class of Warrant or Right, Outstanding             100,000  
Class of Warrant or Right, Exercise Price of Warrants or Rights             $ 2.20  
Notes Payable             $ 1,000,000  
Class Of Warrant Or Right Exercised         100,000      
Noncash Warrants Exercised         50,000      
Stock Issued During Period, Shares, Warrants Exercised         25,000      
Incentive Compensation Plan [Member]                
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]                
Common Stock, Capital Shares Reserved for Future Issuance               1,630,000
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized   $ 214,000   $ 214,000        
Performance Share Award Agreement [Member]                
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]                
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period 161,766              
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number   129,000   129,000