Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands	Common Stock [Member]	Additional Paid-In Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income [Member]	Treasury Stock [Member]	Total
Balance at Dec. 31, 2016	$ 3,757	$ 123,166	$ 148,027	$ 10,371	$ (19,585)
Acquisition of treasury stock					(4,425)
Shares issued under employee benefit plans					247
Equity based compensation		46
Shares issued under employee benefit plans (value)		(102)
Net (loss) income			636			$ 636
Additional minimum pension liability, net of tax				46
Unrealized holding gains arising during period, net of tax				5,135
Reclassification adjustment for losses (gains) included in net income, net of tax				(1,619)
Balance at Jun. 30, 2017	3,757	123,110	148,663	13,933	(23,763)	265,700
Balance at Mar. 31, 2017	3,757	123,183	152,013	12,178	(20,105)
Acquisition of treasury stock					(3,862)
Shares issued under employee benefit plans					204
Equity based compensation		19
Shares issued under employee benefit plans (value)		(92)
Net (loss) income			(3,350)			(3,350)
Additional minimum pension liability, net of tax				23
Unrealized holding gains arising during period, net of tax				1,725
Reclassification adjustment for losses (gains) included in net income, net of tax				7
Balance at Jun. 30, 2017	3,757	123,110	148,663	13,933	(23,763)	265,700
Balance at Dec. 31, 2017	3,757	123,180	136,474	12,234	(24,527)	251,118
Acquisition of treasury stock					(1,464)
Reclassification of certain tax effects from accumulated other comprehensive income at January 1, 2018			(2,619)	2,619
Shares issued under employee benefit plans					406
Equity based compensation		1
Shares issued under employee benefit plans (value)		(164)
Net (loss) income			5,737			5,737
Additional minimum pension liability, net of tax				42
Unrealized holding gains arising during period, net of tax				1,238
Reclassification adjustment for losses (gains) included in net income, net of tax				(5)
Balance at Jun. 30, 2018	3,757	123,017	156,585	(865)	(25,585)	256,909
Balance at Mar. 31, 2018	3,757	123,224	151,495	(2,419)	(24,904)
Acquisition of treasury stock					(1,087)
Shares issued under employee benefit plans					406
Equity based compensation		(43)
Shares issued under employee benefit plans (value)		(164)
Net (loss) income			5,090			5,090
Additional minimum pension liability, net of tax				21
Unrealized holding gains arising during period, net of tax				1,550
Reclassification adjustment for losses (gains) included in net income, net of tax				(17)
Balance at Jun. 30, 2018	$ 3,757	$ 123,017	156,585	(865)	$ (25,585)	$ 256,909
Cumulative effect of adoption of updated accounting guidance for equity financial instruments at January 1, 2018			$ 16,993	$ (16,993)