14. Earnings per share (Details) - Earnings Per Share (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Earnings Per Share [Abstract]
Net income (in Dollars)	$ 1,109	$ 1,451	$ 1,215	$ 1,160	$ 1,882	$ 23	$ 508	$ 1,208	$ 4,935	$ 3,621	$ 4,676
Basic: Weighted average common shares outstanding									8,589	9,032	9,443
Add: Dilutive effect of outstanding options as determined by the treasury stock method									114	89	160
Diluted: Weighted average common and common equivalent shares outstanding									8,703	9,121	9,603
Net income per common share:
Basic (in Dollars per share)	$ 0.13	$ 0.17	$ 0.14	$ 0.13	$ 0.21	$ 0.00	$ 0.06	$ 0.13	$ 0.57	$ 0.40	$ 0.50
Diluted (in Dollars per share)	$ 0.13	$ 0.17	$ 0.14	$ 0.13	$ 0.21	$ 0.00	$ 0.06	$ 0.13	$ 0.57	$ 0.40	$ 0.49