Quarterly Information (Schedule Of Quarterly Effect Of Restatement) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Prepaid income taxes		$ 942	$ 1,590	$ 1,470	$ 924
Deferred income taxes	108	117	117	117	117
Total current assets	6,071	6,931	7,071	8,234	8,004
Total assets	37,263	38,942	40,323	41,880	42,122
Deferred income taxes	649	421	429	154	114
Pension and postretirement benefit obligations	267	7,351	7,722	7,827	1,089
Total liabilities	24,257	28,186	30,388	30,823	29,024
Accumulated other comprehensive loss	(1,436)	(3,565)	(3,710)	(3,855)	(3,999)
Retained earnings	8,205	8,521	8,178	9,850	12,191
Total shareholders' equity	13,006	10,756	9,935	11,057	13,098	24,876	35,148
Total liabilities and shareholders' equity	37,263	38,942	40,323	41,880	42,122
As Previously Reported [Member]
Prepaid income taxes		1,272	1,667	1,670	1,222
Deferred income taxes		268	268	268	268
Total current assets		7,412	7,299	8,585	8,453
Deferred income taxes		797	771	823	874
Total assets		40,220	41,322	43,054	43,445
Pension and postretirement benefit obligations		7,661	7,929	7,931
Total liabilities		28,075	30,166	30,773	28,910
Accumulated other comprehensive loss		(3,720)	(3,813)	(3,906)
Retained earnings		10,065	9,502	11,125	13,628
Total shareholders' equity		12,145	11,156	12,281	14,535	24,876
Total liabilities and shareholders' equity		40,220	41,322	43,054	43,445
Correction Of Errors [Member]
Prepaid income taxes		(330)	(77)	(200)	(298)
Deferred income taxes		(151)	(151)	(151)	(151)
Total current assets		(481)	(228)	(351)	(449)
Deferred income taxes		(797)	(771)	(823)	(874)
Total assets		(1,278)	(999)	(1,174)	(1,323)
Deferred income taxes		421	429	154	114
Pension and postretirement benefit obligations		(310)	(207)	(104)
Total liabilities		111	222	50	114
Accumulated other comprehensive loss		155	103	51
Retained earnings		(1,544)	(1,324)	(1,275)	(1,437)
Total shareholders' equity		(1,389)	(1,221)	(1,224)	(1,437)
Total liabilities and shareholders' equity		$ (1,278)	$ (999)	$ (1,174)	$ (1,323)