Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Consolidated Statements of Comprehensive Income (Loss)
Net income	$ 1,106	$ 1,100	$ 8,099
Other comprehensive income (loss):
Unrealized holding gain (loss) on investments arising during period		64	(4)
Retirement plan loss	(9,437)	(8,863)	(31,124)
Income tax benefit on comprehensive loss	3,607	3,358	11,897
Other comprehensive loss, net of tax	(5,830)	(5,441)	(19,231)
Comprehensive loss	$ (4,724)	$ (4,341)	$ (11,132)