Stockholders' Equity - Summary of common shareholders' equity (Details) - USD ($) $ in Thousands		3 Months Ended	9 Months Ended
		Sep. 30, 2015	Sep. 30, 2015
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			$ 14,068
Stock based compensation, net of tax benefit			12
Balance		$ 14,080	14,080
Retained earnings
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance			9,176
Net income (loss)			4,136
Cash dividend			(375)
Balance		12,937	12,937
ESOT
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance			(964)
Balance		(964)	(964)
Treasury stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance			(1,909)
Purchase of treasury shares			(114)
Stock based compensation, net of tax benefit			236
Balance		(1,787)	(1,787)
Accumulated Other Comprehensive Loss
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance			(14)
Balance		(14)	(14)
Balance			$ 20,880
Balance (shares)			2,614,506
Net income (loss)		744	$ 4,136
Purchase of treasury shares			(114)
Cash dividend			(375)
Stock based compensation, net of tax benefit			248
Balance	[1]	$ 24,775	$ 24,775
Balance (shares)	[1]	2,614,506	2,614,506

[1] (Unaudited)