6. Earnings per share (Detail) - Earnings per Share Calculation (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Net income (in Dollars)	$ 23	$ 839	$ 1,739	$ 4,106
Basic: Weighted average common shares outstanding	8,822	9,471	9,110	9,435
Add: Dilutive effect of outstanding options and restricted stock as determined by the treasury stock method	89	190	95	216
Diluted: Weighted average common and common equivalent shares outstanding	8,911	9,661	9,205	9,651
Net income per common share:
Basic (in Dollars per share)	$ 0.00	$ 0.09	$ 0.19	$ 0.44
Diluted (in Dollars per share)	$ 0.00	$ 0.09	$ 0.19	$ 0.43