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Net Income per Common Share (Details) (USD $)
 3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Net income $ 1,960,000 $ 1,151,000 $ 5,230,000 $ 6,127,000
Weighted average common shares outstanding — basic 7,257,000 7,127,000 7,186,000 7,094,000
Effect of dilutive securities $ 161,000 $ 256,000 $ 225,000 $ 287,000
Weighted average common and potentially issuable common shares outstanding — diluted 7,418,000 7,383,000 7,411,000 7,381,000
Basic net income per common share $ 0.27 $ 0.16 $ 0.73 $ 0.86
Diluted net income per common share $ 0.26 $ 0.16 $ 0.71 $ 0.83
Antidilutive securities excluded from computation of earnings per share, amount     0 0