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Stock-Based Compensation; Changes in Equity (Details) - USD ($)
 9 Months Ended 12 Months Ended
Sep. 30, 2017
Dec. 31, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Shares, Outstanding at the end of period (in shares) 128,469  
Shares under Option, Exercisable (in shares) 100,788  
Weighted Average Exercise Price, Outstanding at the end of period (in dollars per share) $ 5.23  
Weighted Average Exercise Price, Exercisable (in dollars per share) $ 5.21  
Weighted Average Remaining Contractual Life, Outstanding (in years) 1 year 3 months 18 days  
Weighted Average Remaining Contractual Life, Exercisable (in years) 9 months 18 days  
Aggregate Intrinsic Value Outstanding (in dollars) $ 0  
Aggregate Intrinsic Value, Exercisable (in dollars) $ 0  
Employee Stock Option [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Shares, Outstanding, beginning of period (in shares) 143,094  
Shares under Option, Granted (in shares) 0  
Shares under Option, Cancelled (in shares) 14,625  
Shares under Option, Exercised (in shares) 0  
Shares, Outstanding at the end of period (in shares) 128,469 143,094
Shares under Option, Exercisable (in shares) 100,788  
Weighted Average Exercise Price, Outstanding, beginning of period (in dollars per share) $ 5.22  
Weighted Average Exercise Price, Granted (in dollars per share) 0  
Weighted Average Exercise Price, Cancelled (in dollars per share) 5.14  
Weighted Average Exercise Price, Exercised (in dollars per share) 0  
Weighted Average Exercise Price, Outstanding at the end of period (in dollars per share) 5.23 $ 5.22
Weighted Average Exercise Price, Exercisable (in dollars per share) $ 5.21  
Weighted Average Remaining Contractual Life, Outstanding (in years) 1 year 3 months 18 days 2 years 10 months 24 days
Weighted Average Remaining Contractual Life, Exercisable (in years) 9 months 18 days  
Aggregate Intrinsic Value Outstanding (in dollars) $ 0 $ 89,494
Aggregate Intrinsic Value, Exercisable (in dollars) $ 0