CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock [Member]	Additional Paid-In Capital [Member]	Treasury Stock [Member]	Accumulated Deficit [Member]	Accumulated Other Comprehensive Loss [Member]
Balance at Dec. 31, 2017	$ 67,290	$ 368	$ 130,897	$ (53,666)	$ (7,577)	$ (2,732)
Balance (in shares) at Dec. 31, 2017		36,803		(5,351)
Net loss attributable to common stockholders	(1,558)	$ 0	0	$ 0	(1,558)	0
Settlement of stock awards	(541)	$ 2	0	$ (543)	0	0
Settlement of stock awards (in shares)		182		(79)
Stock-based compensation expense	538	$ 0	538	$ 0	0	0
Balance at Mar. 31, 2018	65,729	$ 370	131,435	$ (54,209)	(9,135)	(2,732)
Balance (in shares) at Mar. 31, 2018		36,985		(5,430)
Balance at Dec. 31, 2017	67,290	$ 368	130,897	$ (53,666)	(7,577)	(2,732)
Balance (in shares) at Dec. 31, 2017		36,803		(5,351)
Net loss attributable to common stockholders	(3,399)
Unrealized loss on pension liability	0
Balance at Jun. 30, 2018	63,854	$ 371	131,915	$ (54,724)	(10,976)	(2,732)
Balance (in shares) at Jun. 30, 2018		37,146		(5,508)
Balance at Mar. 31, 2018	65,729	$ 370	131,435	$ (54,209)	(9,135)	(2,732)
Balance (in shares) at Mar. 31, 2018		36,985		(5,430)
Net loss attributable to common stockholders	(1,841)	$ 0	0	$ 0	(1,841)	0
Settlement of stock awards	(514)	$ 1	0	$ (515)	0	0
Settlement of stock awards (in shares)		161		(78)
Stock-based compensation expense	480	$ 0	480	$ 0	0	0
Balance at Jun. 30, 2018	63,854	$ 371	131,915	$ (54,724)	(10,976)	(2,732)
Balance (in shares) at Jun. 30, 2018		37,146		(5,508)
Balance at Dec. 31, 2018	59,461	$ 372	132,831	$ (54,758)	(15,466)	(3,518)
Balance (in shares) at Dec. 31, 2018		37,161		(5,514)
Net loss attributable to common stockholders	(2,213)	$ 0	0	$ 0	(2,213)	0
Settlement of stock awards	(563)	$ 3	0	$ (566)	0	0
Settlement of stock awards (in shares)		329		(134)
Unrealized loss on pension liability	116	$ 0	0	$ 0	1,649	(1,533)
Stock-based compensation expense	332	0	332	0	0	0
Balance at Mar. 31, 2019	57,133	$ 375	133,163	$ (55,324)	(16,030)	(5,051)
Balance (in shares) at Mar. 31, 2019		37,490		(5,648)
Balance at Dec. 31, 2018	59,461	$ 372	132,831	$ (54,758)	(15,466)	(3,518)
Balance (in shares) at Dec. 31, 2018		37,161		(5,514)
Net loss attributable to common stockholders	(4,621)
Unrealized loss on pension liability	231
Balance at Jun. 30, 2019	54,989	$ 376	133,514	$ (55,527)	(18,438)	(4,936)
Balance (in shares) at Jun. 30, 2019		37,599		(5,699)
Balance at Mar. 31, 2019	57,133	$ 375	133,163	$ (55,324)	(16,030)	(5,051)
Balance (in shares) at Mar. 31, 2019		37,490		(5,648)
Net loss attributable to common stockholders	(2,408)	$ 0	0	$ 0	(2,408)	0
Settlement of stock awards	(202)	$ 1	0	$ (203)	0	0
Settlement of stock awards (in shares)		109		(51)
Unrealized loss on pension liability	115	$ 0	0	$ 0	0	115
Stock-based compensation expense	351	0	351	0	0	0
Balance at Jun. 30, 2019	$ 54,989	$ 376	$ 133,514	$ (55,527)	$ (18,438)	$ (4,936)
Balance (in shares) at Jun. 30, 2019		37,599		(5,699)