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Earnings Per Common Share (EPS) (Details) - $ / shares
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Shares used in calculation of diluted EPS    
Weighted average common shares outstanding 1,983,553 2,018,753
Weighted average common and common equivalent shares outstanding 1,983,553 2,018,753
Stock Options.    
Dilutive effect    
Based on the Company's net income position, dilutive effect of stock options (in shares) 0 250
Based on the Company's net income position, dilutive effect of stock options, weighted average exercise price (in dollars per share)   $ 7.54
Based on the Company's net income position, anti-dilutive securities (in shares) 18,168 15,918
Based on the Company's net income position, anti-dilutive securities, weighted average exercise price (in dollars per share) $ 13.81 $ 14.51