Condensed Consolidated Statement of Shareholders' Equity Statement - USD ($) $ in Thousands	Total	Common Stock	Capital in Excess of Par Value	Retained Deficit	Accumulated Other Comprehensive Loss
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cumulative-effect adjustment for the adoption of ASU 2017-12				$ 275	$ (275)
Balance, shares at Dec. 31, 2017		22,018,010
Balance, value at Dec. 31, 2017	$ 66,894	$ 220	$ 333,011	(161,165)	(105,172)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(3,932)			(3,932)
Other comprehensive income (loss)	(50)				(50)
Stock compensation expense	2,059		2,059
Dividends	(2,595)			(2,595)
Stock withheld for employee taxes	(304)		(304)
Stock issued, shares		127,290
Stock issued, value	97	$ 1	96
Balance, shares at Sep. 30, 2018		22,145,300
Balance, value at Sep. 30, 2018	$ 62,169	$ 221	$ 334,862	$ (167,417)	$ (105,497)