CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) shares in Thousands, $ in Thousands	Common Stock	Additional Paid-In Capital	Treasury Stock	Accumulated Deficit	Accumulated Other Comprehensive Loss	Total
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 income (loss) attributable 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 gain (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 (in 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)
Net income (loss) attributable to common stockholders	$ 0	0	$ 0	6,494	0	6,494
Settlement of stock awards	$ 5	0	$ (701)	0	0	(696)
Settlement of stock awards (in shares)	543		(222)
Unrealized gain (loss) on pension liability	$ 0	0	$ 0	0	1,015	1,015
Stock-based compensation expense	0	1,163	0	0	0	1,163
Stock-based consulting fees	$ 2	598	0	0	0	600
Stock-based consulting fees (in shares)	190
Stock buy-back	$ 0	0	$ (359)	0	0	(359)
Stock buy-back (in shares)			(220)
Balance at Dec. 31, 2020	$ 383	135,978	$ (56,791)	(9,503)	(2,159)	67,908
Balance (in shares) at Dec. 31, 2020	38,345		(6,173)
Net income (loss) attributable to common stockholders	$ 0	0	$ 0	(16,474)	0	(16,474)
Sale of common stock	$ 42	7,597	0	0	0	7,639
Sale of common stock (in shares)	4,144
Settlement of stock awards	$ 5	0	$ (375)	0	0	(370)
Settlement of stock awards (in shares)	535		(225)
Unrealized gain (loss) on pension liability	$ 0	0	$ 0	0	816	816
Stock-based compensation expense	$ 0	707	$ 0	0	0	707
Stock buy-back (in shares)	0		0
Balance at Dec. 31, 2021	$ 430	$ 144,282	$ (57,166)	$ (25,977)	$ (1,343)	$ 60,226
Balance (in shares) at Dec. 31, 2021	43,024		(6,398)