4. Earnings per share (Details) - Earnings per share reconciliation - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Earnings Per Share Reconciliation [Abstract]
Net income (in Dollars)	$ 753	$ 1,388	$ 1,378	$ 1,532
Shares:
Basic: Weighted average common shares outstanding	7,689	7,798	7,761	7,827
Add: Dilutive effect of outstanding options as determined by the treasury stock method	54	21	52	20
Diluted: Weighted average common and common equivalent shares outstanding	7,743	7,819	7,813	7,847
Net income per common share:
Basic (in Dollars per share)	$ 0.10	$ 0.18	$ 0.18	$ 0.20
Diluted (in Dollars per share)	$ 0.10	$ 0.18	$ 0.18	$ 0.20