CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND RETAINED EARNINGS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 29, 2019	Jun. 30, 2018	Jun. 29, 2019	Jun. 30, 2018
CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND RETAINED EARNINGS
Net sales	$ 25,257	$ 25,557	$ 47,786	$ 48,967
Type of Revenue [Extensible List]	us-gaap:ProductMember	us-gaap:ProductMember	us-gaap:ProductMember	us-gaap:ProductMember
Costs and expenses:
Cost of sales (exclusive of depreciation, depletion and amortization)	$ 21,535	$ 19,583	$ 39,382	$ 37,988
Depreciation, depletion and amortization	254	405	772	810
Selling and administrative	9,096	4,649	15,889	9,839
Charges related to write-off of deferred development		(94)		6,840
(Gain) Loss on legal settlement	219		(14,781)
Gain on disposition of property and equipment	(428)		(433)
Total costs and expenses	30,676	24,543	40,829	55,477
Operating (loss) income	(5,419)	1,014	6,957	(6,510)
Interest income	161	21	310	45
Interest expense	(102)	(167)	(174)	(275)
Other income, net	45	22	58	41
Income (loss) from continuing operations before income taxes	(5,315)	890	7,151	(6,699)
Provision (benefit) for income taxes	(1,397)	223	1,969	(1,675)
Net income (loss) from continuing operations	(3,918)	667	5,182	(5,024)
(Loss) Income from discontinued operations net of income tax (benefit) provision	(918)	1,446	3,304	944
Net (loss) income	(4,836)	2,113	8,486	(4,080)
Retained earnings, beginning of period	74,453	60,794	61,131	66,987
Retained earnings, end of period	$ 69,617	$ 62,907	$ 69,617	$ 62,907
Basic and diluted income (loss) per share:
(Loss) income from continuing operations	$ (2.28)	$ 0.39	$ 3.03	$ (2.96)
(Loss) income from discontinued operations	(0.54)	0.85	1.93	0.56
Basic and diluted (loss) income per share (in dollar per share)	$ (2.82)	$ 1.24	$ 4.96	$ (2.40)
Average shares outstanding (in shares)	1,715	1,698	1,712	1,697