Revision of Previously Issued Consolidated Financial Statements - Equity Statement (Details) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended				6 Months Ended	9 Months Ended	12 Months Ended
	Mar. 31, 2022	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2021	Sep. 30, 2021	Dec. 31, 2021	Dec. 31, 2020
Revision of Previously Issued Consolidated Financial Statements
Balance	$ 55,418	$ 52,641	$ 57,376	$ 64,378	$ 64,378	$ 64,378	$ 64,378	$ 57,792
Net income (loss) attributable to common stockholders	(2,538)	(1,352)	(5,032)	(6,924)	(11,956)	(13,308)	(17,752)	4,863
Sale of common stock		166				167	7,639
Settlement of stock awards	(291)		1	(370)	(369)	(370)	(370)	(696)
Unrealized gain (loss) on pension liability	119	119	118	119	237	356	816	1,015
Stock-based compensation expense	169	178	178	173	351	529	707	1,163
Stock-based consulting fees								600
Stock buy-back								(359)
Balance	52,877	51,752	52,641	57,376	52,641	51,752	55,418	64,378
Common Stock
Revision of Previously Issued Consolidated Financial Statements
Balance	$ 430	$ 389	$ 388	$ 383	$ 383	$ 383	$ 383	$ 376
Balance (in shares)	43,024	38,853	38,841	38,345	38,345	38,345	38,345	37,612
Sale of common stock		$ 1				$ 2	$ 42
Sale of common stock (in shares)		150				150	4,144
Settlement of stock awards	$ 4		$ 1	$ 5	$ 6	$ 5	$ 5	$ 5
Settlement of stock awards (in shares)	364	13	12	496	508	521	535	543
Stock-based consulting fees								$ 2
Stock-based consulting fees (in shares)								190
Balance	$ 434	$ 390	$ 389	$ 388	$ 389	$ 390	$ 430	$ 383
Balance (in shares)	43,388	39,016	38,853	38,841	38,853	39,016	43,024	38,345
Additional Paid-In Capital
Revision of Previously Issued Consolidated Financial Statements
Balance	$ 144,282	$ 136,329	$ 136,151	$ 135,978	$ 135,978	$ 135,978	$ 135,978	$ 134,217
Sale of common stock		165				165	7,597
Stock-based compensation expense	169	178	178	173	351	529	707	1,163
Stock-based consulting fees								598
Balance	144,451	136,672	136,329	136,151	136,329	136,672	144,282	135,978
Treasury Stock
Revision of Previously Issued Consolidated Financial Statements
Balance	$ (57,166)	$ (57,166)	$ (57,166)	$ (56,791)	$ (56,791)	$ (56,791)	$ (56,791)	$ (55,731)
Balance (in shares)	(6,398)	(6,398)	(6,398)	(6,173)	(6,173)	(6,173)	(6,173)	(5,731)
Settlement of stock awards	$ (295)			$ (375)	$ (375)	$ (375)	$ (375)	$ (701)
Settlement of stock awards (in shares)	(153)			(225)	(225)	(225)	(225)	(222)
Stock buy-back								$ (359)
Stock buy-back (in shares)								(220)
Balance	$ (57,461)	$ (57,166)	$ (57,166)	$ (57,166)	$ (57,166)	$ (57,166)	$ (57,166)	$ (56,791)
Balance (in shares)	(6,551)	(6,398)	(6,398)	(6,398)	(6,398)	(6,398)	(6,398)	(6,173)
Accumulated Deficit
Revision of Previously Issued Consolidated Financial Statements
Balance	$ (30,785)	$ (24,989)	$ (19,957)	$ (13,033)	$ (13,033)	$ (13,033)	$ (13,033)	$ (17,896)
Net income (loss) attributable to common stockholders	(2,538)	(1,352)	(5,032)	(6,924)	(11,956)	(13,308)	(17,752)	4,863
Balance	(33,323)	(26,341)	(24,989)	(19,957)	(24,989)	(26,341)	(30,785)	(13,033)
Accumulated Other Comprehensive Loss
Revision of Previously Issued Consolidated Financial Statements
Balance	(1,343)	(1,922)	(2,040)	(2,159)	(2,159)	(2,159)	(2,159)	(3,174)
Unrealized gain (loss) on pension liability	119	119	118	119	237	356	816	1,015
Balance	(1,224)	(1,803)	(1,922)	(2,040)	(1,922)	(1,803)	(1,343)	(2,159)
Previously Reported
Revision of Previously Issued Consolidated Financial Statements
Balance	60,226	56,824	61,241	67,908	67,908	67,908	67,908	59,691
Net income (loss) attributable to common stockholders		(1,032)	(4,714)	(6,589)	(11,303)	(12,335)	(16,474)	6,494
Sale of common stock		166				167	7,639
Settlement of stock awards			1	(370)	(369)	(370)	(370)	(696)
Unrealized gain (loss) on pension liability		119	118	119	237	356	816	1,015
Stock-based compensation expense		178	178	173	351	529	707	1,163
Stock-based consulting fees								600
Stock buy-back								(359)
Balance		56,255	56,824	61,241	56,824	56,255	60,226	67,908
Previously Reported | Common Stock
Revision of Previously Issued Consolidated Financial Statements
Balance	$ 430	$ 389	$ 388	$ 383	$ 383	$ 383	$ 383	$ 376
Balance (in shares)	43,024	38,853	38,841	38,345	38,345	38,345	38,345	37,612
Sale of common stock		$ 1				$ 2	$ 42
Sale of common stock (in shares)		150				150	4,144
Settlement of stock awards			$ 1	$ 5	$ 6	$ 5	$ 5	$ 5
Settlement of stock awards (in shares)		13	12	496	508	521	535	543
Stock-based consulting fees								$ 2
Stock-based consulting fees (in shares)								190
Balance		$ 390	$ 389	$ 388	$ 389	$ 390	$ 430	$ 383
Balance (in shares)		39,016	38,853	38,841	38,853	39,016	43,024	38,345
Previously Reported | Additional Paid-In Capital
Revision of Previously Issued Consolidated Financial Statements
Balance	$ 144,282	$ 136,329	$ 136,151	$ 135,978	$ 135,978	$ 135,978	$ 135,978	$ 134,217
Sale of common stock		165					7,597
Sale of common stock (in shares)						165
Stock-based compensation expense		178	178	173	351	$ 529	707	1,163
Stock-based consulting fees								598
Balance		136,672	136,329	136,151	136,329	136,672	144,282	135,978
Previously Reported | Treasury Stock
Revision of Previously Issued Consolidated Financial Statements
Balance	$ (57,166)	$ (57,166)	$ (57,166)	$ (56,791)	$ (56,791)	$ (56,791)	$ (56,791)	$ (55,731)
Balance (in shares)	(6,398)	(6,398)	(6,398)	(6,173)	(6,173)	(6,173)	(6,173)	(5,731)
Settlement of stock awards				$ (375)	$ (375)	$ (375)	$ (375)	$ (701)
Settlement of stock awards (in shares)				(225)	(225)	(225)	(225)	(222)
Stock buy-back								$ (359)
Stock buy-back (in shares)								(220)
Balance		$ (57,166)	$ (57,166)	$ (57,166)	$ (57,166)	$ (57,166)	$ (57,166)	$ (56,791)
Balance (in shares)		(6,398)	(6,398)	(6,398)	(6,398)	(6,398)	(6,398)	(6,173)
Previously Reported | Accumulated Deficit
Revision of Previously Issued Consolidated Financial Statements
Balance	$ (25,977)	$ (20,806)	$ (16,092)	$ (9,503)	$ (9,503)	$ (9,503)	$ (9,503)	$ (15,997)
Net income (loss) attributable to common stockholders		(1,032)	(4,714)	(6,589)	(11,303)	(12,335)	(16,474)	6,494
Balance		(21,838)	(20,806)	(16,092)	(20,806)	(21,838)	(25,977)	(9,503)
Previously Reported | Accumulated Other Comprehensive Loss
Revision of Previously Issued Consolidated Financial Statements
Balance	(1,343)	(1,922)	(2,040)	(2,159)	(2,159)	(2,159)	(2,159)	(3,174)
Unrealized gain (loss) on pension liability		119	118	119	237	356	816	1,015
Balance		(1,803)	(1,922)	(2,040)	(1,922)	(1,803)	(1,343)	(2,159)
Error Related to Classification of Real Estate Under Development | Restatement Impact
Revision of Previously Issued Consolidated Financial Statements
Balance	(4,808)	(4,183)	(3,865)	(3,530)	(3,530)	(3,530)	(3,530)	(1,899)
Net income (loss) attributable to common stockholders		(320)	(318)	(335)	(653)	(973)	(1,278)	(1,631)
Balance		(4,503)	(4,183)	(3,865)	(4,183)	(4,503)	(4,808)	(3,530)
Error Related to Classification of Real Estate Under Development | Restatement Impact | Accumulated Deficit
Revision of Previously Issued Consolidated Financial Statements
Balance	$ (4,808)	(4,183)	(3,865)	(3,530)	(3,530)	(3,530)	(3,530)	(1,899)
Net income (loss) attributable to common stockholders		(320)	(318)	(335)	(653)	(973)	(1,278)	(1,631)
Balance		$ (4,503)	$ (4,183)	$ (3,865)	$ (4,183)	$ (4,503)	$ (4,808)	$ (3,530)