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Net Income per Common Share (Details) (USD $)
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Net income $ 1,589,000 $ 2,341,000 $ 3,270,000 $ 4,976,000
Weighted average common shares outstanding — basic 7,169,000 7,086,000 7,150,000 7,077,000
Effect of dilutive securities $ 258,000 $ 274,000 $ 256,000 $ 301,000
Weighted average common and potentially issuable common shares outstanding — diluted 7,427,000 7,360,000 7,406,000 7,378,000
Basic net income per common share $ 0.22 $ 0.33 $ 0.46 $ 0.70
Diluted net income per common share $ 0.21 $ 0.32 $ 0.44 $ 0.67
Antidilutive securities excluded from computation of earnings per share, amount     0 0