5. Earnings per share (Details) - Earnings Per Share Reconciliation (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Earnings Per Share Reconciliation [Abstract]
Net income (in Dollars)	$ 1,451	$ 23	$ 3,826	$ 1,739
Basic: Weighted average common shares outstanding	8,582	8,822	8,675	9,110
Add: Dilutive effect of outstanding options as determined by the treasury stock method	113	89	84	95
Diluted: Weighted average common and common equivalent shares outstanding	8,695	8,911	8,759	9,205
Net income per common share:
Basic (in Dollars per share)	$ 0.17	$ 0.00	$ 0.44	$ 0.19
Diluted (in Dollars per share)	$ 0.17	$ 0.00	$ 0.44	$ 0.19