Consolidated Statements of Operations and Retained Earnings - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 28, 2020	Mar. 30, 2019
Consolidated Statements of Operations
Net sales	$ 30,845	$ 22,528
Type of Revenue [Extensible List]	us-gaap:ProductMember	us-gaap:ProductMember
Costs and expenses:
Cost of sales (exclusive of depreciation and amortization)	$ 22,565	$ 17,847
Depreciation and amortization	513	519
Selling and administrative	7,778	6,792
Gain on legal settlement		(15,000)
Gain on disposition of property and equipment	(145)	(5)
Total costs and expenses	30,711	10,153
Operating income	134	12,375
Interest income	114	149
Interest expense	(101)	(71)
Other income, net	59	13
Income from continuing operations before income taxes	206	12,466
Provision for income taxes	498	(3,366)
Income from continuing operations	704	9,100
Income from discontinued operations net of income tax provision of $0 and $1,562		4,222
Net income	704	13,322
Retained earnings, beginning of period	47,232	61,131
Retained earnings, end of period	$ 47,936	$ 74,453
Basic and diluted loss per share:
Income from continuing operations	$ 0.42	$ 5.33
Income from discontinued operations		2.47
Basic and diluted income per share (in dollar per share)	$ 0.42	$ 7.80
Average shares outstanding (in shares)	1,685	1,709