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Net Income per Common Share (Details) - USD ($)
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Earnings Per Share [Abstract]    
Net income $ 2,890,000 $ 3,196,000
Weighted average common shares outstanding — basic 7,597,000 7,561,000
Effect of dilutive securities $ 10,000 $ 46,000
Weighted average common and potentially issuable common shares outstanding — diluted 7,607,000 7,607,000
Basic net income per common share (USD per share) $ 0.38 $ 0.42
Diluted net income per common share (USD per share) $ 0.38 $ 0.42