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, 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	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				45,000