CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) shares in Thousands, $ in Thousands	Common Stock	Additional Paid-in Capital	Retained Earnings	Treasury Stock	Total
Balance at Dec. 31, 2019	$ 120	$ 63,238	$ 73,769	$ (58,916)	$ 78,211
Balance (in shares) at Dec. 31, 2019	11,988
Increase (Decrease) in Stockholders' Equity
Issuance of treasury stock		(4,327)		4,327
Stock-based compensation		471			471
Forfeited restricted stock (in shares)	(15)
Net share settlement related to vested equity awards		(57)			(57)
Net share settlement related to vested equity awards (in shares)	(11)
Net income (loss)			(2,551)		(2,551)
Balance at Mar. 31, 2020	$ 120	59,325	71,218	(54,589)	76,074
Balance (in shares) at Mar. 31, 2020	11,962
Balance at Dec. 31, 2019	$ 120	63,238	73,769	(58,916)	78,211
Balance (in shares) at Dec. 31, 2019	11,988
Increase (Decrease) in Stockholders' Equity
Net income (loss)					(3,482)
Balance at Jun. 30, 2020	$ 120	59,565	70,287	(54,466)	75,506
Balance (in shares) at Jun. 30, 2020	12,036
Balance at Mar. 31, 2020	$ 120	59,325	71,218	(54,589)	76,074
Balance (in shares) at Mar. 31, 2020	11,962
Increase (Decrease) in Stockholders' Equity
Issuance of treasury stock		(123)		123
Stock-based compensation		363			363
Restricted stock award grant (in shares)	74
Net income (loss)			(931)		(931)
Balance at Jun. 30, 2020	$ 120	59,565	70,287	(54,466)	75,506
Balance (in shares) at Jun. 30, 2020	12,036
Balance at Dec. 31, 2020	$ 120	60,692	78,515	(54,626)	84,701
Balance (in shares) at Dec. 31, 2020	12,038
Increase (Decrease) in Stockholders' Equity
Stock-based compensation		168			168
Restricted stock award grant	$ 2	(2)
Restricted stock award grant (in shares)	193
Forfeited restricted stock (in shares)	(4)
Net share settlement related to vested equity awards		797		(802)	(5)
Net income (loss)			3,597		3,597
Balance at Mar. 31, 2021	$ 122	61,655	82,112	(55,428)	88,461
Balance (in shares) at Mar. 31, 2021	12,227
Balance at Dec. 31, 2020	$ 120	60,692	78,515	(54,626)	84,701
Balance (in shares) at Dec. 31, 2020	12,038
Increase (Decrease) in Stockholders' Equity
Net income (loss)					7,790
Balance at Jun. 30, 2021	$ 123	62,268	86,305	(55,468)	93,228
Balance (in shares) at Jun. 30, 2021	12,253
Balance at Mar. 31, 2021	$ 122	61,655	82,112	(55,428)	88,461
Balance (in shares) at Mar. 31, 2021	12,227
Increase (Decrease) in Stockholders' Equity
Stock-based compensation		577			577
Restricted stock award grant	$ 1				1
Restricted stock award grant (in shares)	26
Net share settlement related to vested equity awards		36		(40)	(4)
Net income (loss)			4,193		4,193
Balance at Jun. 30, 2021	$ 123	$ 62,268	$ 86,305	$ (55,468)	$ 93,228
Balance (in shares) at Jun. 30, 2021	12,253