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Net Income per Common Share (Details) (USD $)
 3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Net income $ 1,151,000 $ 2,856,000 $ 6,127,000 $ 7,967,000
Weighted average common shares outstanding — basic 7,127,000 6,976,000 7,094,000 6,926,000
Effect of dilutive securities $ 256,000 $ 302,000 $ 287,000 $ 358,000
Weighted average common and potentially issuable common shares outstanding — diluted 7,383,000 7,278,000 7,381,000 7,284,000
Basic net income per common share $ 0.16 $ 0.41 $ 0.86 $ 1.15
Diluted net income per common share $ 0.16 $ 0.39 $ 0.83 $ 1.09
Antidilutive securities excluded from computation of earnings per share, amount     5,000 5,000