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, 2015	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Earnings Per Share Reconciliation [Abstract]
Net income (in Dollars)	$ 1,388	$ 1,388	$ 175	$ 1,532	$ 569
Shares:
Basic: Weighted average common shares outstanding	7,798	7,798	8,376	7,827	8,374
Add: Dilutive effect of outstanding options as determined by the treasury stock method	21		144	20	164
Diluted: Weighted average common and common equivalent shares outstanding	7,819	7,819	8,520	7,847	8,538
Net income per common share:
Basic (in Dollars per share)	$ 0.18	$ 0.18	$ 0.02	$ 0.20	$ 0.07
Diluted (in Dollars per share)	$ 0.18	$ 0.18	$ 0.02	$ 0.20	$ 0.07