Restatement of Previously Issued Financial Statements - Statements of Operations (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2020	Jun. 30, 2019
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Revenue	$ 138,297		$ 131,065		$ 259,143	$ 257,707
Cost of sales	103,043		102,558		198,849	202,498
Gross profit	35,254		28,507		60,294	55,209
Selling, general and administrative expenses	24,035		24,976		48,248	51,222
Amortization of intangible assets	324		346		648	691
Operating profit	10,895		3,185		11,398	3,296
Interest expense, net	366		789		969	1,452
Other expense (income), net	(193)		(132)		1,509	(329)
Income (loss) from continuing operations before income taxes	10,722		2,528		8,920	2,173
Income tax expense (benefit)	2,657		630		2,209	937
Net income (loss) from continuing operations	8,065		1,898		6,711	1,236
Income (loss) from discontinued operations, net of tax	(305)		(2,516)		22,561	(5,239)
Net income (loss)	$ 7,760	$ 21,512	$ (618)	$ (3,385)	$ 29,272	$ (4,003)
Earnings Per Share, Basic and Diluted [Abstract]
Basic and diluted earnings (loss) per share, continuing operations (in usd per share)	$ 0.59		$ 0.14		$ 0.49	$ 0.09
Basic and diluted earnings (loss) per share, discontinued operations (in usd per share)	(0.02)		(0.18)		1.65	(0.38)
Basic and diluted earnings per share (in dollars per share)	$ 0.57		$ (0.04)		$ 2.14	$ (0.29)
Basic weighted average shares outstanding (in shares)	13,644,000		13,813,000		13,635,000	13,800,000
Diluted weighted average shares outstanding (in shares)	13,670,000		13,826,000		13,657,000	13,813,000
As Previously Reported
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Revenue			$ 148,427			$ 293,804
Cost of sales			112,770			223,424
Gross profit			35,657			70,380
Selling, general and administrative expenses			35,617			72,124
Amortization of intangible assets			346			691
Operating profit			(306)			(2,435)
Interest expense, net			904			1,650
Other expense (income), net			(126)			(458)
Income (loss) from continuing operations before income taxes			(1,084)			(3,627)
Income tax expense (benefit)			(140)			(922)
Net income (loss) from continuing operations			(944)			(2,705)
Income (loss) from discontinued operations, net of tax			0			0
Net income (loss)			$ (944)			$ (2,705)
Earnings Per Share, Basic and Diluted [Abstract]
Basic and diluted earnings (loss) per share, continuing operations (in usd per share)			$ (0.07)			$ (0.20)
Basic and diluted earnings (loss) per share, discontinued operations (in usd per share)			0			0
Basic and diluted earnings per share (in dollars per share)			$ (0.07)			$ (0.20)
Basic weighted average shares outstanding (in shares)			13,813,000			13,800,000
Diluted weighted average shares outstanding (in shares)			13,813,000			13,800,000
Restatement Impacts
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Revenue			$ 921			$ 1,439
Cost of sales			0			(65)
Gross profit			921			1,504
Selling, general and administrative expenses			594			2,566
Amortization of intangible assets			0			0
Operating profit			327			(1,062)
Interest expense, net			0			0
Other expense (income), net			0			144
Income (loss) from continuing operations before income taxes			327			(1,206)
Income tax expense (benefit)			1			92
Net income (loss) from continuing operations			326			(1,298)
Income (loss) from discontinued operations, net of tax			0			0
Net income (loss)			$ 326			$ (1,298)
Earnings Per Share, Basic and Diluted [Abstract]
Basic and diluted earnings (loss) per share, continuing operations (in usd per share)			$ 0.03			$ (0.09)
Basic and diluted earnings (loss) per share, discontinued operations (in usd per share)			0			0
Basic and diluted earnings per share (in dollars per share)			$ 0.03			$ (0.09)
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			$ 149,348			$ 295,243
Cost of sales			112,770			223,359
Gross profit			36,578			71,884
Selling, general and administrative expenses			36,211			74,690
Amortization of intangible assets			346			691
Operating profit			21			(3,497)
Interest expense, net			904			1,650
Other expense (income), net			(126)			(314)
Income (loss) from continuing operations before income taxes			(757)			(4,833)
Income tax expense (benefit)			(139)			(830)
Net income (loss) from continuing operations			(618)			(4,003)
Income (loss) from discontinued operations, net of tax			0			0
Net income (loss)			$ (618)			$ (4,003)
Earnings Per Share, Basic and Diluted [Abstract]
Basic and diluted earnings (loss) per share, continuing operations (in usd per share)			$ (0.04)			$ (0.29)
Basic and diluted earnings (loss) per share, discontinued operations (in usd per share)			0			0
Basic and diluted earnings per share (in dollars per share)			$ (0.04)			$ (0.29)
Basic weighted average shares outstanding (in shares)			13,813,000			13,800,000
Diluted weighted average shares outstanding (in shares)			13,813,000			13,800,000
Recasting Impacts
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Revenue			$ (18,283)			$ (37,536)
Cost of sales			(10,212)			(20,861)
Gross profit			(8,071)			(16,675)
Selling, general and administrative expenses			(11,235)			(23,468)
Amortization of intangible assets			0			0
Operating profit			3,164			6,793
Interest expense, net			(115)			(198)
Other expense (income), net			(6)			(15)
Income (loss) from continuing operations before income taxes			3,285			7,006
Income tax expense (benefit)			769			1,767
Net income (loss) from continuing operations			2,516			5,239
Income (loss) from discontinued operations, net of tax			(2,516)			(5,239)
Net income (loss)			$ 0			$ 0
Earnings Per Share, Basic and Diluted [Abstract]
Basic and diluted earnings (loss) per share, continuing operations (in usd per share)			$ 0.18			$ 0.38
Basic and diluted earnings (loss) per share, discontinued operations (in usd per share)			(0.18)			(0.38)
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)			13,000			13,000