CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($)	Common Stock [Member]	Additional Paid-In Capital [Member]	Treasury Stock [Member]	Accumulated Deficit [Member]	Accumulated Other Comprehensive Loss [Member]	Total
Balance at Dec. 31, 2017	$ 368,000	$ 130,897,000	$ (53,666,000)	$ (7,577,000)	$ (2,732,000)	$ 67,290,000
Balance (in shares) at Dec. 31, 2017	36,803		(5,351)
Net loss attributable to common stockholders	$ 0	0	$ 0	(1,558,000)	0	(1,558,000)
Settlement of stock awards	$ 2,000	0	$ (543,000)	0	0	(541,000)
Settlement of stock awards (in shares)	182		(79)
Stock-based compensation expense	$ 0	538,000	$ 0	0	0	538,000
Balance at Mar. 31, 2018	$ 370,000	131,435,000	$ (54,209,000)	(9,135,000)	(2,732,000)	65,729,000
Balance (in shares) at Mar. 31, 2018	36,985		(5,430)
Balance at Dec. 31, 2017	$ 368,000	130,897,000	$ (53,666,000)	(7,577,000)	(2,732,000)	67,290,000
Balance (in shares) at Dec. 31, 2017	36,803		(5,351)
Net loss attributable to common stockholders						(5,703,000)
Unrealized loss on pension liability						0
Balance at Sep. 30, 2018	$ 372,000	132,378,000	$ (54,746,000)	(13,280,000)	(2,732,000)	61,992,000
Balance (in shares) at Sep. 30, 2018	37,156		(5,512)
Balance at Mar. 31, 2018	$ 370,000	131,435,000	$ (54,209,000)	(9,135,000)	(2,732,000)	65,729,000
Balance (in shares) at Mar. 31, 2018	36,985		(5,430)
Net loss attributable to common stockholders	$ 0	0	$ 0	(1,841,000)	0	(1,841,000)
Settlement of stock awards	$ 1,000	0	$ (515,000)	0	0	(514,000)
Settlement of stock awards (in shares)	161		(78)
Stock-based compensation expense	$ 0	480,000	$ 0	0	0	480,000
Balance at Jun. 30, 2018	$ 371,000	131,915,000	$ (54,724,000)	(10,976,000)	(2,732,000)	63,854,000
Balance (in shares) at Jun. 30, 2018	37,146		(5,508)
Net loss attributable to common stockholders	$ 0	0	$ 0	(2,304,000)	0	(2,304,000)
Settlement of stock awards	$ 1,000	0	$ (22,000)	0	0	(21,000)
Settlement of stock awards (in shares)	10		(4)
Stock-based compensation expense	$ 0	463,000	$ 0	0	0	463,000
Balance at Sep. 30, 2018	$ 372,000	132,378,000	$ (54,746,000)	(13,280,000)	(2,732,000)	61,992,000
Balance (in shares) at Sep. 30, 2018	37,156		(5,512)
Balance at Dec. 31, 2018	$ 372,000	132,831,000	$ (54,758,000)	(15,466,000)	(3,518,000)	59,461,000
Balance (in shares) at Dec. 31, 2018	37,161		(5,514)
Net loss attributable to common stockholders	$ 0	0	$ 0	(2,213,000)	0	(2,213,000)
Settlement of stock awards	$ 3,000	0	$ (566,000)	0	0	(563,000)
Settlement of stock awards (in shares)	329		(134)
Unrealized loss on pension liability	$ 0	0	$ 0	1,649,000	(1,533,000)	116,000
Stock-based compensation expense	0	332,000	0	0	0	332,000
Balance at Mar. 31, 2019	$ 375,000	133,163,000	$ (55,324,000)	(16,030,000)	(5,051,000)	57,133,000
Balance (in shares) at Mar. 31, 2019	37,490		(5,648)
Balance at Dec. 31, 2018	$ 372,000	132,831,000	$ (54,758,000)	(15,466,000)	(3,518,000)	59,461,000
Balance (in shares) at Dec. 31, 2018	37,161		(5,514)
Net loss attributable to common stockholders						(7,266,000)
Unrealized loss on pension liability						(346,000)
Balance at Sep. 30, 2019	$ 376,000	133,867,000	$ (55,527,000)	(21,083,000)	(4,820,000)	52,813,000
Balance (in shares) at Sep. 30, 2019	37,603		(5,699)
Balance at Mar. 31, 2019	$ 375,000	133,163,000	$ (55,324,000)	(16,030,000)	(5,051,000)	57,133,000
Balance (in shares) at Mar. 31, 2019	37,490		(5,648)
Net loss attributable to common stockholders	$ 0	0	$ 0	(2,408,000)	0	(2,408,000)
Settlement of stock awards	$ 1,000	0	$ (203,000)	0	0	(202,000)
Settlement of stock awards (in shares)	109		(51)
Unrealized loss on pension liability	$ 0	0	$ 0	0	115,000	115,000
Stock-based compensation expense	0	351,000	0	0	0	351,000
Balance at Jun. 30, 2019	$ 376,000	133,514,000	$ (55,527,000)	(18,438,000)	(4,936,000)	54,989,000
Balance (in shares) at Jun. 30, 2019	37,599		(5,699)
Net loss attributable to common stockholders	$ 0	0	$ 0	(2,645,000)	0	(2,645,000)
Settlement of stock awards	$ 0	0	$ 0	0	0
Settlement of stock awards (in shares)	4		0
Unrealized loss on pension liability	$ 0	0	$ 0	0	116,000	116,000
Stock-based compensation expense	0	353,000	0	0	0	353,000
Balance at Sep. 30, 2019	$ 376,000	$ 133,867,000	$ (55,527,000)	$ (21,083,000)	$ (4,820,000)	$ 52,813,000
Balance (in shares) at Sep. 30, 2019	37,603		(5,699)