CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) shares in Thousands, $ in Thousands	Common Stock [Member]	Additional Paid-In Capital [Member]	Treasury Stock [Member]	Accumulated Deficit [Member]	Accumulated Other Comprehensive Loss [Member]	Total
Balance at Dec. 31, 2016	$ 307	$ 87,521	$ (51,086)	$ (5,556)	$ (3,161)	$ 28,025
Balance (in shares) at Dec. 31, 2016	30,680		(5,016)
Net loss available to common stockholders	$ 0	0	$ 0	(2,021)	0	(2,021)
Sale of common stock, net	$ 55	40,506	$ 0	0	0	40,561
Sale of common stock, net (in shares)	5,472		0
Settlement of stock awards	$ 6	0	$ (2,580)	0	0	(2,574)
Settlement of stock awards (in shares)	651		(335)
Unrealized loss on pension liability	$ 0	0	$ 0	0	429	429
Stock-based compensation expense	0	2,870	0	0	0	2,870
Balance at Dec. 31, 2017	$ 368	130,897	$ (53,666)	(7,577)	(2,732)	67,290
Balance (in shares) at Dec. 31, 2017	36,803		(5,351)
Net loss available to common stockholders	$ 0	0	$ 0	(7,889)	0	(7,889)
Settlement of stock awards	$ 4	0	$ (1,092)	0	0	(1,088)
Settlement of stock awards (in shares)	358		(163)
Unrealized loss on pension liability	$ 0	0	$ 0	0	(786)	(786)
Stock-based compensation expense	0	1,934	0	0	0	1,934
Balance at Dec. 31, 2018	$ 372	132,831	$ (54,758)	(15,466)	(3,518)	59,461
Balance (in shares) at Dec. 31, 2018	37,161		(5,514)
Net loss available to common stockholders	$ 0	0	$ 0	(2,179)	0	(2,179)
Settlement of stock awards	$ 4	0	$ (776)	0	0	(772)
Settlement of stock awards (in shares)	451		(187)
Unrealized loss on pension liability	$ 0	0	$ 0	1,648	344	1,992
Stock-based compensation expense	0	1,386	0	0	0	1,386
Stock buy-back	$ 0	0	$ (197)	0	0	(197)
Stock buy-back shares	0		(30)
Balance at Dec. 31, 2019	$ 376	$ 134,217	$ (55,731)	$ (15,997)	$ (3,174)	$ 59,691
Balance (in shares) at Dec. 31, 2019	37,612		(5,731)