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6. Earnings per share (Detail) - Earnings per Share Calculation (USD $)
In Thousands, except Share data, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Net income (in Dollars) $ 508 $ 1,442 $ 1,716 $ 3,267
Basic: Weighted average common shares outstanding 9,084 9,388 9,256 9,417
Add: Dilutive effect of outstanding options and restricted stock as determined by the treasury stock method 105 279 101 259
Diluted: Weighted average common and common equivalent shares outstanding 9,189 9,667 9,357 9,676
Net income per common share:        
Basic (in Dollars per share) $ 0.06 $ 0.15 $ 0.19 $ 0.35
Diluted (in Dollars per share) $ 0.06 $ 0.15 $ 0.18 $ 0.34