Restatement of Previously Issued Financial Statements - Statements of Operations (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2020	Sep. 30, 2019
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Revenue	$ 110,549			$ 149,508			$ 369,692	$ 407,216
Cost of sales	86,801			118,562			285,650	321,061
Gross profit	23,748			30,946			84,042	86,155
Selling, general and administrative expenses	25,830			26,162			74,078	77,385
Amortization of intangible assets	323			345			971	1,036
Operating (loss) profit	(2,405)			4,439			8,993	7,734
Interest expense, net	339			756			1,308	2,208
Other expense (income), net	92			681			1,601	352
Income (loss) from continuing operations before income taxes	(2,836)			3,002			6,084	5,174
Income tax expense (benefit)	(826)			2,449			1,383	3,385
Net income (loss) from continuing operations	(2,010)			553			4,701	1,789
Income (loss) from discontinued operations, net of tax	0			(2,753)			22,561	(7,992)
Net income (loss)	$ (2,010)	$ 7,760	$ 21,512	$ (2,200)	$ (618)	$ (3,385)	$ 27,262	$ (6,203)
Basic and diluted earnings (loss) per share:
Continuing operations (in dollars per share)	$ (0.15)			$ 0.04			$ 0.34	$ 0.13
Discontinued operations (in dollars per share)	0			(0.20)			1.65	(0.58)
Basic and diluted earnings per share (in dollars per share)	$ (0.15)			$ (0.16)			$ 1.99	$ (0.45)
Basic weighted average shares outstanding (in shares)	13,670			13,579			13,646	13,726
Diluted weighted average shares outstanding (in shares)	13,686			13,595			13,667	13,731
As Previously Reported
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Revenue				$ 169,778				$ 463,582
Cost of sales				129,194				352,618
Gross profit				40,584				110,964
Selling, general and administrative expenses				36,182				108,306
Amortization of intangible assets				345				1,036
Operating (loss) profit				4,057				1,622
Interest expense, net				864				2,514
Other expense (income), net				688				230
Income (loss) from continuing operations before income taxes				2,505				(1,122)
Income tax expense (benefit)				2,108				1,186
Net income (loss) from continuing operations				397				(2,308)
Income (loss) from discontinued operations, net of tax				0				0
Net income (loss)				$ 397				$ (2,308)
Basic and diluted earnings (loss) per share:
Continuing operations (in dollars per share)				$ 0.03				$ (0.17)
Discontinued operations (in dollars per share)				0				0
Basic and diluted earnings per share (in dollars per share)				$ 0.03				$ (0.17)
Basic weighted average shares outstanding (in shares)				13,579				13,726
Diluted weighted average shares outstanding (in shares)				13,595				13,726
Restatement Impacts
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Revenue				$ 18				$ 1,458
Cost of sales				0				(64)
Gross profit				18				1,522
Selling, general and administrative expenses				2,570				5,137
Amortization of intangible assets				0				0
Operating (loss) profit				(2,552)				(3,615)
Interest expense, net				0				0
Other expense (income), net				0				144
Income (loss) from continuing operations before income taxes				(2,552)				(3,759)
Income tax expense (benefit)				45				136
Net income (loss) from continuing operations				(2,597)				(3,895)
Income (loss) from discontinued operations, net of tax				0				0
Net income (loss)				$ (2,597)				$ (3,895)
Basic and diluted earnings (loss) per share:
Continuing operations (in dollars per share)				$ (0.19)				$ (0.28)
Discontinued operations (in dollars per share)				0				0
Basic and diluted earnings per share (in dollars per share)				$ (0.19)				$ (0.28)
Basic weighted average shares outstanding (in shares)				0				0
Diluted weighted average shares outstanding (in shares)				0				0
As Restated
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Revenue				$ 169,796				$ 465,040
Cost of sales				129,194				352,554
Gross profit				40,602				112,486
Selling, general and administrative expenses				38,752				113,443
Amortization of intangible assets				345				1,036
Operating (loss) profit				1,505				(1,993)
Interest expense, net				864				2,514
Other expense (income), net				688				374
Income (loss) from continuing operations before income taxes				(47)				(4,881)
Income tax expense (benefit)				2,153				1,322
Net income (loss) from continuing operations				(2,200)				(6,203)
Income (loss) from discontinued operations, net of tax				0				0
Net income (loss)				$ (2,200)				$ (6,203)
Basic and diluted earnings (loss) per share:
Continuing operations (in dollars per share)				$ (0.16)				$ (0.45)
Discontinued operations (in dollars per share)				0				0
Basic and diluted earnings per share (in dollars per share)				$ (0.16)				$ (0.45)
Basic weighted average shares outstanding (in shares)				13,579				13,726
Diluted weighted average shares outstanding (in shares)				13,595				13,726
Recasting Impacts
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Revenue				$ (20,288)				$ (57,824)
Cost of sales				(10,632)				(31,493)
Gross profit				(9,656)				(26,331)
Selling, general and administrative expenses				(12,590)				(36,058)
Amortization of intangible assets				0				0
Operating (loss) profit				2,934				9,727
Interest expense, net				(108)				(306)
Other expense (income), net				(7)				(22)
Income (loss) from continuing operations before income taxes				3,049				10,055
Income tax expense (benefit)				296				2,063
Net income (loss) from continuing operations				2,753				7,992
Income (loss) from discontinued operations, net of tax				(2,753)				(7,992)
Net income (loss)				$ 0				$ 0
Basic and diluted earnings (loss) per share:
Continuing operations (in dollars per share)				$ 0.20				$ 0.58
Discontinued operations (in dollars per share)				(0.20)				(0.58)
Basic and diluted earnings per share (in dollars per share)				$ 0				$ 0
Basic weighted average shares outstanding (in shares)				0				0
Diluted weighted average shares outstanding (in shares)				0				5