Consolidated Statements of Stockholders' Equity (Unaudited) - USD ($) shares in Thousands, $ in Thousands	Restricted Stock Units (RSUs) [Member] Common Stock [Member]	Restricted Stock Units (RSUs) [Member] Additional Paid-in Capital [Member]	Restricted Stock Units (RSUs) [Member] Retained Earnings [Member]	Restricted Stock Units (RSUs) [Member] AOCI Attributable to Parent [Member]	Restricted Stock Units (RSUs) [Member]	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	AOCI Attributable to Parent [Member]	Total
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
Vesting of restricted stock units	$ 0	$ 0	$ 0	$ 0	$ 0
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)
Net income (loss)						0	0	5,793	0	5,793
Other comprehensive income (loss)						$ 0	0	0	(129)	(129)
Retirement of common stock for minimum tax withholdings (in shares)						4
Forfeiture of restricted stock awards (in shares)						(9)
Forfeiture of restricted stock awards						$ 0	0	0	0	0
Repurchase of common stock (in shares)						(139)
Repurchase of common stock						$ (1)	1	0	0	0
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
Issuance of common stock for equity awards (in shares)						2
Issuance of common stock for equity awards						$ 0	68	0	0	68
Vesting of restricted stock units (in shares)						7
Vesting of restricted stock units						$ 0	0	0	0	0
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 income (loss)						$ 0	0	0	209	209
Retirement of common stock for minimum tax withholdings (in shares)						3
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
Vesting of restricted stock units						$ 0	0	0	0	0
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 income (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
Balance (in shares) at Dec. 31, 2020						14,329
Balance at Dec. 31, 2020						$ 143	55,355	221,444	(4,542)	272,400
Issuance of common stock for equity awards (in shares)						0
Issuance of common stock for equity awards						$ 0	1	0	0	1
Vesting of restricted stock units (in shares)	46
Vesting of restricted stock units	$ 1	$ (1)
Stock-based compensation expense						$ 0	2,259	0	0	2,259
Retirement of common stock for minimum tax withholdings (in shares)						(9)
Retirement of common stock for minimum tax withholdings						$ 0	(333)	0	0	(333)
Net income (loss)						0	0	2,838	0	2,838
Other comprehensive income (loss)						$ 0	0	0	(509)	(509)
Retirement of common stock for minimum tax withholdings (in shares)						9
Stock-based compensation expense						$ 0	2,259	0	0	2,259
Balance (in shares) at Mar. 31, 2021						14,366
Balance at Mar. 31, 2021						$ 144	57,281	224,282	(5,051)	276,656
Balance (in shares) at Dec. 31, 2020						14,329
Balance at Dec. 31, 2020						$ 143	55,355	221,444	(4,542)	272,400
Net income (loss)										9,927
Balance (in shares) at Sep. 30, 2021						14,436
Balance at Sep. 30, 2021						$ 144	63,864	231,371	(5,319)	290,060
Balance (in shares) at Mar. 31, 2021						14,366
Balance at Mar. 31, 2021						$ 144	57,281	224,282	(5,051)	276,656
Issuance of common stock for equity awards (in shares)						18
Issuance of common stock for equity awards						$ 0	640	0	0	640
Vesting of restricted stock units (in shares)						35
Vesting of restricted stock units						$ 0	0	0	0	0
Stock-based compensation expense						$ 0	2,797	0	0	2,797
Retirement of common stock for minimum tax withholdings (in shares)						(1)
Retirement of common stock for minimum tax withholdings						$ 0	(19)	0	0	(19)
Net income (loss)						0	0	6,531	0	6,531
Other comprehensive income (loss)						$ 0	0	0	199	199
Retirement of common stock for minimum tax withholdings (in shares)						1
Stock-based compensation expense						$ 0	2,797	0	0	2,797
Balance (in shares) at Jun. 30, 2021						14,418
Balance at Jun. 30, 2021						$ 144	60,699	230,813	(4,852)	286,804
Issuance of common stock for equity awards (in shares)						10
Issuance of common stock for equity awards						$ 0	373	0	0	373
Vesting of restricted stock units (in shares)						9
Vesting of restricted stock units						$ 0	0	0	0	0
Stock-based compensation expense						$ 0	2,863	0	0	2,863
Retirement of common stock for minimum tax withholdings (in shares)						1
Retirement of common stock for minimum tax withholdings						$ 0	(71)	0	0	(71)
Net income (loss)						0	0	558	0	558
Other comprehensive income (loss)						$ 0	0	0	(467)	(467)
Retirement of common stock for minimum tax withholdings (in shares)						(1)
Stock-based compensation expense						$ 0	2,863	0	0	2,863
Balance (in shares) at Sep. 30, 2021						14,436
Balance at Sep. 30, 2021						$ 144	$ 63,864	$ 231,371	$ (5,319)	$ 290,060