Condensed Consolidated Statements of Equity - Unaudited - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Accumulated Deficit	Treasury Stock
Balance at beginning of period (in shares) at Dec. 31, 2019		20,067,000
Balance at beginning of period at Dec. 31, 2019	$ 178,255	$ 20	$ 345,234	$ (164,010)	$ (2,989)
Balance at beginning of period, treasury stock (in shares) at Dec. 31, 2019					284,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation expense	475		475
Purchases of treasury stock (in shares)					398,000
Purchases of treasury stock	(3,629)				$ (3,629)
Retirement of treasury stock (in shares)		(637,000)			(637,000)
Retirement of treasury stock	0	$ (1)	(6,265)		$ 6,266
Net income (loss)	(1,811)			(1,811)
Balance at end of period (in shares) at Mar. 31, 2020		19,430,000
Balance at end of period at Mar. 31, 2020	173,290	$ 19	339,444	(165,821)	$ (352)
Balance at end of period, treasury stock (in shares) at Mar. 31, 2020					45,000
Balance at beginning of period (in shares) at Dec. 31, 2019		20,067,000
Balance at beginning of period at Dec. 31, 2019	178,255	$ 20	345,234	(164,010)	$ (2,989)
Balance at beginning of period, treasury stock (in shares) at Dec. 31, 2019					284,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	(95)
Balance at end of period (in shares) at Sep. 30, 2020		18,802,000
Balance at end of period at Sep. 30, 2020	169,978	$ 19	334,184	(164,105)	$ (120)
Balance at end of period, treasury stock (in shares) at Sep. 30, 2020					13,000
Balance at beginning of period (in shares) at Mar. 31, 2020		19,430,000
Balance at beginning of period at Mar. 31, 2020	173,290	$ 19	339,444	(165,821)	$ (352)
Balance at beginning of period, treasury stock (in shares) at Mar. 31, 2020					45,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation expense	22		22
Purchases of treasury stock (in shares)					358,000
Purchases of treasury stock	(2,862)				$ (2,862)
Retirement of treasury stock (in shares)		(392,000)			(392,000)
Retirement of treasury stock	0		(3,125)		$ 3,125
Net income (loss)	1,864			1,864
Balance at end of period (in shares) at Jun. 30, 2020		19,038,000
Balance at end of period at Jun. 30, 2020	172,314	$ 19	336,341	(163,957)	$ (89)
Balance at end of period, treasury stock (in shares) at Jun. 30, 2020					11,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation expense	22		22
Distribution to noncontrolling interest	(146)		(146)
Purchases of treasury stock (in shares)					238,000
Purchases of treasury stock	(2,064)				$ (2,064)
Retirement of treasury stock (in shares)		(236,000)			(236,000)
Retirement of treasury stock	0		(2,033)		$ 2,033
Net income (loss)	(148)			(148)
Balance at end of period (in shares) at Sep. 30, 2020		18,802,000
Balance at end of period at Sep. 30, 2020	$ 169,978	$ 19	334,184	(164,105)	$ (120)
Balance at end of period, treasury stock (in shares) at Sep. 30, 2020					13,000
Balance at beginning of period (in shares) at Dec. 31, 2020	18,586,000	18,586,000
Balance at beginning of period at Dec. 31, 2020	$ 178,270	$ 19	332,290	(154,009)	$ (30)
Balance at beginning of period, treasury stock (in shares) at Dec. 31, 2020	3,000				3,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation expense	$ 42		42
Purchases of treasury stock (in shares)					107,000
Purchases of treasury stock	(986)				$ (986)
Retirement of treasury stock (in shares)		(104,000)			(104,000)
Retirement of treasury stock	(1)	$ (1)	(959)		$ 959
Net income (loss)	532			532
Balance at end of period (in shares) at Mar. 31, 2021		18,482,000
Balance at end of period at Mar. 31, 2021	$ 177,857	$ 18	331,373	(153,477)	$ (57)
Balance at end of period, treasury stock (in shares) at Mar. 31, 2021					6,000
Balance at beginning of period (in shares) at Dec. 31, 2020	18,586,000	18,586,000
Balance at beginning of period at Dec. 31, 2020	$ 178,270	$ 19	332,290	(154,009)	$ (30)
Balance at beginning of period, treasury stock (in shares) at Dec. 31, 2020	3,000				3,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	$ (766)
Balance at end of period (in shares) at Sep. 30, 2021	18,333,000	18,333,000
Balance at end of period at Sep. 30, 2021	$ 175,135	$ 18	329,910	(154,775)	$ (18)
Balance at end of period, treasury stock (in shares) at Sep. 30, 2021	2,000				2,000
Balance at beginning of period (in shares) at Mar. 31, 2021		18,482,000
Balance at beginning of period at Mar. 31, 2021	$ 177,857	$ 18	331,373	(153,477)	$ (57)
Balance at beginning of period, treasury stock (in shares) at Mar. 31, 2021					6,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation expense	22		22
Exercise of restricted stock units (in shares)		1,000
Withholding taxes paid on vested restricted stock units	(6)		(6)
Purchases of treasury stock (in shares)					130,000
Purchases of treasury stock	(1,177)				$ (1,177)
Retirement of treasury stock (in shares)		(136,000)			(136,000)
Retirement of treasury stock	0		(1,234)		$ 1,234
Net income (loss)	(278)			(278)
Balance at end of period (in shares) at Jun. 30, 2021		18,347,000
Balance at end of period at Jun. 30, 2021	176,418	$ 18	330,155	(153,755)	$ 0
Balance at end of period, treasury stock (in shares) at Jun. 30, 2021					0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation expense	22		22
Distribution to noncontrolling interest	(91)		(91)
Purchases of treasury stock (in shares)					16,000
Purchases of treasury stock	(194)				$ (194)
Retirement of treasury stock (in shares)		(14,000)			(14,000)
Retirement of treasury stock	0		(176)		$ 176
Net income (loss)	$ (1,020)			(1,020)
Balance at end of period (in shares) at Sep. 30, 2021	18,333,000	18,333,000
Balance at end of period at Sep. 30, 2021	$ 175,135	$ 18	$ 329,910	$ (154,775)	$ (18)
Balance at end of period, treasury stock (in shares) at Sep. 30, 2021	2,000				2,000