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Net Income per Common Share (Details) (USD $)
 3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Earnings Per Share [Abstract]        
Net income $ 2,520,000 $ 1,589,000 $ 4,640,000 $ 3,270,000
Weighted average common shares outstanding — basic 7,519,000 7,169,000 7,467,000 7,150,000
Effect of dilutive securities $ 97,000 $ 258,000 $ 75,000 $ 256,000
Weighted average common and potentially issuable common shares outstanding — diluted 7,616,000 7,427,000 7,542,000 7,406,000
Basic net income per common share (USD per share) $ 0.34 $ 0.22 $ 0.62 $ 0.46
Diluted net income per common share (USD per share) $ 0.33 $ 0.21 $ 0.62 $ 0.44
Antidilutive securities excluded from computation of earnings per share, amount   0 0