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, 2019	$ 376	$ 134,217	$ (55,731)	$ (17,896)	$ (3,174)	$ 57,792
Balance (in shares) at Dec. 31, 2019	37,612		(5,731)
Net income (loss) attributable to common stockholders				4,863		4,863
Settlement of stock awards	$ 5		$ (701)			(696)
Settlement of stock awards (in shares)	543		(222)
Unrealized gain (loss) on pension liability					1,015	1,015
Stock-based compensation expense		1,163				1,163
Stock-based consulting fees	$ 2	598				600
Stock-based consulting fees (in shares)	190
Stock buy-back			$ (359)			(359)
Stock buy-back (in shares)			(220)
Balance at Dec. 31, 2020	$ 383	135,978	$ (56,791)	(13,033)	(2,159)	64,378
Balance (in shares) at Dec. 31, 2020	38,345		(6,173)
Net income (loss) attributable to common stockholders				(6,924)		(6,924)
Settlement of stock awards	$ 5		$ (375)			(370)
Settlement of stock awards (in shares)	496		(225)
Unrealized gain (loss) on pension liability					119	119
Stock-based compensation expense		173				173
Balance at Mar. 31, 2021	$ 388	136,151	$ (57,166)	(19,957)	(2,040)	57,376
Balance (in shares) at Mar. 31, 2021	38,841		(6,398)
Balance at Dec. 31, 2020	$ 383	135,978	$ (56,791)	(13,033)	(2,159)	64,378
Balance (in shares) at Dec. 31, 2020	38,345		(6,173)
Net income (loss) attributable to common stockholders				(11,956)		(11,956)
Settlement of stock awards	$ 6		$ (375)			(369)
Settlement of stock awards (in shares)	508		(225)
Unrealized gain (loss) on pension liability					237	237
Stock-based compensation expense		351				351
Balance at Jun. 30, 2021	$ 389	136,329	$ (57,166)	(24,989)	(1,922)	52,641
Balance (in shares) at Jun. 30, 2021	38,853		(6,398)
Balance at Dec. 31, 2020	$ 383	135,978	$ (56,791)	(13,033)	(2,159)	64,378
Balance (in shares) at Dec. 31, 2020	38,345		(6,173)
Net income (loss) attributable to common stockholders				(13,308)		(13,308)
Sale of common stock	$ 2	165				167
Sale of common stock (in shares)	150
Settlement of stock awards	$ 5		$ (375)			(370)
Settlement of stock awards (in shares)	521		(225)
Unrealized gain (loss) on pension liability					356	356
Stock-based compensation expense		529				529
Balance at Sep. 30, 2021	$ 390	136,672	$ (57,166)	(26,341)	(1,803)	51,752
Balance (in shares) at Sep. 30, 2021	39,016		(6,398)
Balance at Dec. 31, 2020	$ 383	135,978	$ (56,791)	(13,033)	(2,159)	64,378
Balance (in shares) at Dec. 31, 2020	38,345		(6,173)
Net income (loss) attributable to common stockholders				(17,752)		(17,752)
Sale of common stock	$ 42	7,597				7,639
Sale of common stock (in shares)	4,144
Settlement of stock awards	$ 5		$ (375)			(370)
Settlement of stock awards (in shares)	535		(225)
Unrealized gain (loss) on pension liability					816	816
Stock-based compensation expense		707				707
Balance at Dec. 31, 2021	$ 430	144,282	$ (57,166)	(30,785)	(1,343)	55,418
Balance (in shares) at Dec. 31, 2021	43,024		(6,398)
Balance at Mar. 31, 2021	$ 388	136,151	$ (57,166)	(19,957)	(2,040)	57,376
Balance (in shares) at Mar. 31, 2021	38,841		(6,398)
Net income (loss) attributable to common stockholders				(5,032)		(5,032)
Settlement of stock awards	$ 1					1
Settlement of stock awards (in shares)	12
Unrealized gain (loss) on pension liability					118	118
Stock-based compensation expense		178				178
Balance at Jun. 30, 2021	$ 389	136,329	$ (57,166)	(24,989)	(1,922)	52,641
Balance (in shares) at Jun. 30, 2021	38,853		(6,398)
Net income (loss) attributable to common stockholders				(1,352)		(1,352)
Sale of common stock	$ 1	165				166
Sale of common stock (in shares)	150
Settlement of stock awards (in shares)	13
Unrealized gain (loss) on pension liability					119	119
Stock-based compensation expense		178				178
Balance at Sep. 30, 2021	$ 390	136,672	$ (57,166)	(26,341)	(1,803)	51,752
Balance (in shares) at Sep. 30, 2021	39,016		(6,398)
Balance at Dec. 31, 2021	$ 430	144,282	$ (57,166)	(30,785)	(1,343)	55,418
Balance (in shares) at Dec. 31, 2021	43,024		(6,398)
Net income (loss) attributable to common stockholders				(2,538)		(2,538)
Settlement of stock awards	$ 4		$ (295)			(291)
Settlement of stock awards (in shares)	364		(153)
Unrealized gain (loss) on pension liability					119	119
Stock-based compensation expense		169				169
Balance at Mar. 31, 2022	$ 434	$ 144,451	$ (57,461)	$ (33,323)	$ (1,224)	$ 52,877
Balance (in shares) at Mar. 31, 2022	43,388		(6,551)