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Net Income per Common Share (Details) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Earnings Per Share [Abstract]        
Net income $ 1,029,000 $ 2,484,000 $ 5,379,000 $ 9,719,000
Weighted average common shares outstanding — basic 7,635,000 7,597,000 7,616,000 7,578,000
Weighted Average Number Diluted Shares Outstanding Adjustment 32,000 28,000 33,000 45,000
Weighted average common and potentially issuable common shares outstanding — diluted 7,667,000 7,625,000 7,649,000 7,623,000
Basic net income per common share (USD per share) $ 0.13 $ 0.33 $ 0.71 $ 1.28
Diluted net income per common share (USD per share) $ 0.13 $ 0.33 $ 0.70 $ 1.27