Condensed Consolidated Statements of Operations - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 29, 2019	Sep. 30, 2020	Sep. 29, 2019
Income Statement [Abstract]
Net sales	$ 35,550	$ 38,549	$ 85,286	$ 116,905
Cost of sales	27,474	31,375	68,395	93,219
Gross profit	8,076	7,174	16,891	23,686
Selling, general, and administrative expenses	6,251	6,538	18,397	21,234
Impairment	0	0	0	6,760
Restructuring expenses	0	990	1,193	1,815
Operating income (loss)	1,825	(354)	(2,699)	(6,123)
Other income (expense):
Other, net	32	(13)	26	29
Interest expense	(711)	(1,149)	(3,000)	(3,580)
Other expense, net	(679)	(1,162)	(2,974)	(3,551)
Income (loss) before income tax (benefit)	1,146	(1,516)	(5,673)	(9,674)
Income tax (benefit)	166	(252)	(1,200)	(597)
Net income (loss)	$ 980	$ (1,264)	$ (4,473)	$ (9,077)
Net income (loss) per share:
Basic (in dollars per share)	$ 0.10	$ (0.13)	$ (0.46)	$ (0.93)
Diluted (in dollars per share)	0.10	(0.13)	(0.46)	(0.93)
Dividends declared per share (in dollars per share)	$ 0	$ 0	$ 0	$ 0.05