CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) shares in Thousands, $ in Thousands	Common Stock As Reported	Common Stock	Additional Paid-in Capital As Reported	Additional Paid-in Capital	Retained Earnings As Reported	Retained Earnings Adjustments	Retained Earnings	Treasury Stock As Reported	Treasury Stock	As Reported	Adjustments	Total
Balance at Dec. 31, 2017		$ 121		$ 68,667			$ 65,460		$ (67,760)			$ 66,488
Balance (in shares) at Dec. 31, 2017		12,142
Increase (Decrease) in Stockholders' Equity
Issuance of treasury stock				(2,094)					2,094
Stock-based compensation				(136)								(136)
Forfeited restricted stock (in shares)		(49)
Net share settlement related to restricted stock vesting				(40)								(40)
Net share settlement related to restricted stock vesting (in shares)		(2)
Net income (loss)							1,035					1,035
Balance at Mar. 31, 2018		$ 121		66,397			66,495		(65,666)			67,347
Balance (in shares) at Mar. 31, 2018		12,091
Balance at Dec. 31, 2017		$ 121		68,667			65,460		(67,760)			66,488
Balance (in shares) at Dec. 31, 2017		12,142
Increase (Decrease) in Stockholders' Equity
Net income (loss)												6,879
Balance at Sep. 30, 2018		$ 120		66,355			72,339		(64,976)			73,838
Balance (in shares) at Sep. 30, 2018		12,012
Balance at Mar. 31, 2018		$ 121		66,397			66,495		(65,666)			67,347
Balance (in shares) at Mar. 31, 2018		12,091
Increase (Decrease) in Stockholders' Equity
Issuance of treasury stock				(894)					894
Stock-based compensation				304								304
Forfeited restricted stock		$ (1)		1
Forfeited restricted stock (in shares)		(76)
Net share settlement related to restricted stock vesting				(70)								(70)
Net income (loss)							2,544					2,544
Balance at Jun. 30, 2018		$ 120		65,738			69,039		(64,772)			70,125
Balance (in shares) at Jun. 30, 2018		12,015
Increase (Decrease) in Stockholders' Equity
Issuance of treasury stock				204					(204)
Stock-based compensation				437								437
Forfeited restricted stock (in shares)		(3)
Net share settlement related to restricted stock vesting				(24)								(24)
Net income (loss)							3,300					3,300
Balance at Sep. 30, 2018		$ 120		66,355			72,339		(64,976)			73,838
Balance (in shares) at Sep. 30, 2018		12,012
Increase (Decrease) in Stockholders' Equity
Correction of error (Note 15) | Correction of immaterial errors						$ 803					$ 803
Balance, as adjusted		$ 120		66,433			78,467		(63,747)			81,273
Balance at Dec. 31, 2018	$ 120		$ 66,433		$ 77,664			$ (63,747)		$ 80,470
Balance (in shares) at Dec. 31, 2018	12,012	12,012
Increase (Decrease) in Stockholders' Equity
Issuance of treasury stock				(4,558)					4,558
Stock-based compensation				589								589
Net share settlement related to restricted stock vesting				(72)								(72)
Net share settlement related to restricted stock vesting (in shares)		(5)
Net income (loss)							1,501					1,501
Balance at Mar. 31, 2019		$ 120		62,392			79,968		(59,189)			83,291
Balance (in shares) at Mar. 31, 2019		12,007
Balance at Dec. 31, 2018	$ 120		$ 66,433		$ 77,664			$ (63,747)		$ 80,470
Balance (in shares) at Dec. 31, 2018	12,012	12,012
Increase (Decrease) in Stockholders' Equity
Net income (loss)												129
Balance at Sep. 30, 2019		$ 120		62,585			78,596		(58,790)			82,511
Balance (in shares) at Sep. 30, 2019		11,988
Balance at Mar. 31, 2019		$ 120		62,392			79,968		(59,189)			83,291
Balance (in shares) at Mar. 31, 2019		12,007
Increase (Decrease) in Stockholders' Equity
Issuance of treasury stock				(378)					378
Stock-based compensation				705								705
Forfeited restricted stock (in shares)		(18)
Net share settlement related to restricted stock vesting				(1)								(1)
Net income (loss)							1					1
Balance at Jun. 30, 2019		$ 120		62,718			79,969		(58,811)			83,996
Balance (in shares) at Jun. 30, 2019		11,989
Increase (Decrease) in Stockholders' Equity
Issuance of treasury stock				(21)					21
Stock-based compensation				(107)								(107)
Net share settlement related to restricted stock vesting				(5)								(5)
Net share settlement related to restricted stock vesting (in shares)		(1)
Net income (loss)							(1,373)					(1,373)
Balance at Sep. 30, 2019		$ 120		$ 62,585			$ 78,596		$ (58,790)			$ 82,511
Balance (in shares) at Sep. 30, 2019		11,988