Condensed Consolidated Statements of Equity - Unaudited - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Accumulated Deficit	Treasury Stock
Beginning balance (in shares) at Dec. 31, 2018		20,848,000
Beginning balance at Dec. 31, 2018	$ 176,624	$ 21	$ 353,250	$ (175,536)	$ (1,111)
Beginning balance, treasury stock (in shares) at Dec. 31, 2018					121,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation expense	22		22
Purchases of treasury stock (in shares)					420,000
Purchases of treasury stock	(4,340)				$ (4,340)
Retirement of treasury stock (in shares)		(529,000)			(529,000)
Retirement of treasury stock	0	$ (1)	(5,328)		$ 5,329
Net income (loss)	6,684			6,684
Ending balance (in shares) at Mar. 31, 2019		20,319,000
Ending balance at Mar. 31, 2019	178,990	$ 20	347,944	(168,852)	$ (122)
Ending balance, treasury stock (in shares) at Mar. 31, 2019					12,000
Beginning balance (in shares) at Dec. 31, 2018		20,848,000
Beginning balance at Dec. 31, 2018	176,624	$ 21	353,250	(175,536)	$ (1,111)
Beginning balance, treasury stock (in shares) at Dec. 31, 2018					121,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	6,945
Ending balance (in shares) at Sep. 30, 2019		19,968,000
Ending balance at Sep. 30, 2019	175,552	$ 20	344,193	(168,591)	$ (70)
Ending balance, treasury stock (in shares) at Sep. 30, 2019					7,000
Beginning balance (in shares) at Mar. 31, 2019		20,319,000
Beginning balance at Mar. 31, 2019	178,990	$ 20	347,944	(168,852)	$ (122)
Beginning balance, treasury stock (in shares) at Mar. 31, 2019					12,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation expense	22		22
Exercise of restricted stock units (in shares)
Exercise of restricted stock units	(5)		(5)
Purchases of treasury stock (in shares)					245,000
Purchases of treasury stock	(2,704)				$ (2,704)
Retirement of treasury stock (in shares)		(252,000)			(252,000)
Retirement of treasury stock	0		(2,771)		$ 2,771
Net income (loss)	(1,118)			(1,118)
Ending balance (in shares) at Jun. 30, 2019		20,067,000
Ending balance at Jun. 30, 2019	175,185	$ 20	345,190	(169,970)	$ (55)
Ending balance, treasury stock (in shares) at Jun. 30, 2019					5,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation expense	22		22
Purchases of treasury stock (in shares)					101,000
Purchases of treasury stock	(1,034)				$ (1,034)
Retirement of treasury stock (in shares)		(99,000)			(99,000)
Retirement of treasury stock	0	$ 0	(1,019)		$ 1,019
Net income (loss)	1,379			1,379
Ending balance (in shares) at Sep. 30, 2019		19,968,000
Ending balance at Sep. 30, 2019	$ 175,552	$ 20	344,193	(168,591)	$ (70)
Ending balance, treasury stock (in shares) at Sep. 30, 2019					7,000
Beginning balance (in shares) at Dec. 31, 2019	20,067,000	20,067,000
Beginning balance at Dec. 31, 2019	$ 178,255	$ 20	345,234	(164,010)	$ (2,989)
Beginning balance, treasury stock (in shares) at Dec. 31, 2019	284,000				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)
Ending balance (in shares) at Mar. 31, 2020		19,430,000
Ending balance at Mar. 31, 2020	$ 173,290	$ 19	339,444	(165,821)	$ (352)
Ending balance, treasury stock (in shares) at Mar. 31, 2020					45,000
Beginning balance (in shares) at Dec. 31, 2019	20,067,000	20,067,000
Beginning balance at Dec. 31, 2019	$ 178,255	$ 20	345,234	(164,010)	$ (2,989)
Beginning balance, treasury stock (in shares) at Dec. 31, 2019	284,000				284,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	$ (95)
Ending balance (in shares) at Sep. 30, 2020	18,802,000	18,802,000
Ending balance at Sep. 30, 2020	$ 169,978	$ 19	334,184	(164,105)	$ (120)
Ending balance, treasury stock (in shares) at Sep. 30, 2020	13,000				13,000
Beginning balance (in shares) at Mar. 31, 2020		19,430,000
Beginning balance at Mar. 31, 2020	$ 173,290	$ 19	339,444	(165,821)	$ (352)
Beginning balance, 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
Ending balance (in shares) at Jun. 30, 2020		19,038,000
Ending balance at Jun. 30, 2020	172,314	$ 19	336,341	(163,957)	$ (89)
Ending balance, 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)
Ending balance (in shares) at Sep. 30, 2020	18,802,000	18,802,000
Ending balance at Sep. 30, 2020	$ 169,978	$ 19	$ 334,184	$ (164,105)	$ (120)
Ending balance, treasury stock (in shares) at Sep. 30, 2020	13,000				13,000