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, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Earnings Per Share [Abstract]
Net (loss) income (in Dollars)	$ (3,040)	$ 50	$ 175	$ 394	$ 1,109	$ 1,451	$ 1,215	$ 1,160	$ (2,421)	$ 4,935	$ 3,621
Basic: Weighted average common shares outstanding									8,307	8,589	9,032
Add: Dilutive effect of outstanding options as determined by the treasury stock method										114	89
Diluted: Weighted average common and common equivalent shares outstanding									8,307	8,703	9,121
Net (loss) income per common share:
Basic (in Dollars per share)	$ (0.37)	$ 0.01	$ 0.02	$ 0.05	$ 0.13	$ 0.17	$ 0.14	$ 0.13	$ (0.29)	$ 0.57	$ 0.40
Diluted (in Dollars per share)	$ (0.37)	$ 0.01	$ 0.02	$ 0.05	$ 0.13	$ 0.17	$ 0.14	$ 0.13	$ (0.29)	$ 0.57	$ 0.40