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Net Income per Common Share (Details) (USD $)
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Net income $ 1,681,000 $ 2,635,000
Weighted average common shares outstanding — basic 7,131,000 7,070,000
Effect of dilutive securities $ 255,000 $ 327,000
Weighted average common and potentially issuable common shares outstanding — diluted 7,386,000 7,397,000
Basic net income per common share $ 0.24 $ 0.37
Diluted net income per common share $ 0.23 $ 0.36
Antidilutive securities excluded from computation of earnings per share, amount 0 0