Consolidated Statements of Stockholders' Equity (Unaudited) - USD ($) shares in Thousands, $ in Thousands	Restricted Stock Units (RSUs) [Member] Common Stock [Member]	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	AOCI Attributable to Parent [Member]	Total
Balance (in shares) at Dec. 31, 2018		14,210
Balance at Dec. 31, 2018		$ 142	$ 50,763	$ 218,233	$ (5,526)	$ 263,612
Stock-based compensation expense		$ 0	1,386	0	0	1,386
Retirement of common stock for minimum tax withholdings (in shares)		(3)
Retirement of common stock for minimum tax withholdings		$ 0	(124)	0	0	(124)
Net income (loss)		0	0	4,507	0	4,507
Other comprehensive loss		$ 0	0	0	(315)	(315)
Issuance of common stock for equity awards (in shares)		7
Issuance of common stock for equity awards		$ 0	5	0	0	5
Stock-based compensation expense		$ 0	1,386	0	0	1,386
Balance (in shares) at Mar. 31, 2019		14,214
Balance at Mar. 31, 2019		$ 142	52,030	222,740	(5,841)	269,071
Balance (in shares) at Dec. 31, 2018		14,210
Balance at Dec. 31, 2018		$ 142	50,763	218,233	(5,526)	263,612
Net income (loss)						23,142
Balance (in shares) at Sep. 30, 2019		14,269
Balance at Sep. 30, 2019		$ 143	46,482	241,375	(6,318)	281,682
Balance (in shares) at Mar. 31, 2019		14,214
Balance at Mar. 31, 2019		$ 142	52,030	222,740	(5,841)	269,071
Forfeiture of restricted stock awards (in shares)		(7)
Stock-based compensation expense		$ 0	1,443	0	0	1,443
Repurchase of common stock (in shares)		(452)
Repurchase of common stock		$ (5)	(29,995)	0	0	(30,000)
Net income (loss)		0	0	9,435	0	9,435
Other comprehensive loss		$ 0	0	0	145	145
Issuance of common stock for equity awards (in shares)		30
Issuance of common stock for equity awards		$ 1	851	0	0	852
Stock-based compensation expense		$ 0	1,443	0	0	1,443
Balance (in shares) at Jun. 30, 2019		13,785
Balance at Jun. 30, 2019		$ 138	24,329	232,175	(5,696)	250,946
Forfeiture of restricted stock awards (in shares)		(2)
Stock-based compensation expense		$ 0	1,311	0	0	1,311
Retirement of common stock for minimum tax withholdings (in shares)		(2)
Retirement of common stock for minimum tax withholdings		$ 0	(120)	0	0	(120)
Net income (loss)		0	0	9,200	0	9,200
Other comprehensive loss		$ 0	0	0	(622)	(622)
Issuance of common stock for equity awards (in shares)		488
Issuance of common stock for equity awards		$ 5	20,962	0	0	20,967
Stock-based compensation expense		$ 0	1,311	0	0	1,311
Balance (in shares) at Sep. 30, 2019		14,269
Balance at Sep. 30, 2019		$ 143	46,482	241,375	(6,318)	281,682
Balance (in shares) at Dec. 31, 2019		14,308
Balance at Dec. 31, 2019		$ 143	48,707	245,426	(5,898)	288,378
Vesting of restricted stock units (in shares)	42
Forfeiture of restricted stock awards (in shares)		(9)
Stock-based compensation expense		$ 0	(207)	0	0	(207)
Retirement of common stock for minimum tax withholdings (in shares)		(4)
Retirement of common stock for minimum tax withholdings		$ 0	(141)	0	0	(141)
Repurchase of common stock (in shares)		(139)
Repurchase of common stock		$ (1)	1	0	0	0
Net income (loss)		0	0	5,793	0	5,793
Other comprehensive loss		0	0	0	(129)	(129)
Stock-based compensation expense		$ 0	(207)	0	0	(207)
Balance (in shares) at Mar. 31, 2020		14,198
Balance at Mar. 31, 2020		$ 142	48,360	251,219	(6,027)	293,694
Balance (in shares) at Dec. 31, 2019		14,308
Balance at Dec. 31, 2019		$ 143	48,707	245,426	(5,898)	288,378
Net income (loss)						(8,326)
Balance (in shares) at Sep. 30, 2020		14,208
Balance at Sep. 30, 2020		$ 142	52,505	237,100	(5,296)	284,451
Balance (in shares) at Mar. 31, 2020		14,198
Balance at Mar. 31, 2020		$ 142	48,360	251,219	(6,027)	293,694
Vesting of restricted stock units (in shares)		7
Stock-based compensation expense		$ 0	2,240	0	0	2,240
Retirement of common stock for minimum tax withholdings (in shares)		(3)
Retirement of common stock for minimum tax withholdings		$ 0	(59)	0	0	(59)
Net income (loss)		0	0	(7,708)	0	(7,708)
Other comprehensive loss		$ 0	0	0	209	209
Issuance of common stock for equity awards (in shares)		2
Issuance of common stock for equity awards		$ 0	68	0	0	68
Stock-based compensation expense		$ 0	2,240	0	0	2,240
Balance (in shares) at Jun. 30, 2020		14,204
Balance at Jun. 30, 2020		$ 142	50,609	243,511	(5,818)	288,444
Vesting of restricted stock units (in shares)		4
Stock-based compensation expense		$ 0	1,920	0	0	1,920
Retirement of common stock for minimum tax withholdings		0	(24)	0	0	(24)
Net income (loss)		0	0	(6,411)	0	(6,411)
Other comprehensive loss		0	0	0	522	522
Stock-based compensation expense		$ 0	1,920	0	0	1,920
Balance (in shares) at Sep. 30, 2020		14,208
Balance at Sep. 30, 2020		$ 142	$ 52,505	$ 237,100	$ (5,296)	$ 284,451