Stockholders' Equity - Summary of common shareholders' equity (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance			$ 27,117
Net Income	$ 105	$ 1,004	131	$ 1,262
Purchase of treasury shares			(160)
Cash dividend			(376)
Stock based compensation, net of tax benefit			107
Balance	$ 26,819		$ 26,819
Balance (shares)	2,614,506		2,614,506
ESOT
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance			$ (763)
Balance	$ (763)		(763)
Common Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance			$ 523
Balance (shares)			2,614,506
Balance	$ 523		$ 523
Balance (shares)	2,614,506		2,614,506
Capital in excess of par value
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance			$ 14,160
Stock based compensation, net of tax benefit			6
Balance	$ 14,166		14,166
Retained earnings
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance			14,768
Net Income			131
Cash dividend			(376)
Balance	14,523		14,523
Treasury stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance			(1,551)
Purchase of treasury shares			(160)
Stock based compensation, net of tax benefit			101
Balance	(1,610)		(1,610)
Accumulated other comprehensive loss
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance			(20)
Balance	$ (20)		$ (20)