5. Shareholders' equity (Details) - Changes in shareholders’ equity for the nine months ended September 30, 2016 were as follows (in tho - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Changes in shareholders’ equity for the nine months ended September 30, 2016 were as follows (in tho [Abstract]
Balance at December 31, 2015 (in Shares)			25,728
Net income	$ 883	$ 1,028	$ 2,261	$ 2,560
Share-based compensation expense			$ 473	377
Issuance of deferred stock units, net of relinquishments (in Shares)			151
Issuance of shares from exercise of stock options, net of tax benefit			$ 24
Reversal of deferred tax asset in connection with stock options forfeited			11
Foreign currency translation adjustment	$ (21)		(21)
Dividends declared and paid on common stock			(1,827)
Purchase of common stock for treasury			$ (3,242)	$ (1,020)
Balance at September 30, 2016 (in Shares)	23,558		23,558