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)	$ (15,997)	$ (3,174)	$ 59,691
Balance (in shares) at Dec. 31, 2019	37,612		(5,731)
Net loss attributable to common stockholders	$ 0	0	$ 0	(3,253)	0	(3,253)
Settlement of stock awards	$ 4	0	$ (648)	0	0	(644)
Settlement of stock awards (in shares)	438		(197)
Unrealized gain on pension liability	$ 0	0	$ 0	0	112	112
Stock-based compensation expense	0	280	0	0	0	280
Stock-based consulting fees	$ 2	598	$ 0	0	0	600
Stock-based consulting fees (in shares)	190		0
Stock buy-back	$ 0	0	$ (134)	0	0	(134)
Stock buy-back shares	0		(74)
Balance at Mar. 31, 2020	$ 382	135,095	$ (56,513)	(19,250)	(3,062)	56,652
Balance (in shares) at Mar. 31, 2020	38,240		(6,002)
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 loss attributable to common stockholders	$ 0	0	$ 0	(6,589)	0	(6,589)
Settlement of stock awards	$ 5	0	$ (375)	0	0	(370)
Settlement of stock awards (in shares)	496		(225)
Unrealized gain on pension liability	$ 0	0	$ 0	0	119	119
Stock-based compensation expense	0	173	0	0	0	173
Balance at Mar. 31, 2021	$ 388	$ 136,151	$ (57,166)	$ (16,092)	$ (2,040)	$ 61,241
Balance (in shares) at Mar. 31, 2021	38,841		(6,398)