UNAUDITED QUARTERLY FINANCIAL DATA (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	12 Months Ended
Dec. 28, 2019	Sep. 28, 2019	Jun. 29, 2019	Mar. 30, 2019	Dec. 29, 2018	Sep. 29, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 28, 2019	Dec. 29, 2018
UNAUDITED QUARTERLY FINANCIAL DATA
Net sales	$ 33,504	$ 31,987	$ 25,257	$ 22,528	$ 27,955	$ 23,965	$ 25,557	$ 23,410	$ 113,276	$ 100,887
Gross profit	8,615	7,535	3,722	4,681	6,649	5,225	5,974	5,006
Depreciation and amortization	592	597	254	519	269	393	405	405	1,962	1,472
Net income (loss)	$ (2,100)	$ (20,284)	$ (4,836)	$ 13,322	$ (540)	$ (1,236)	$ 2,113	$ (6,193)	$ (13,899)	$ (5,856)
Basic and diluted income (loss) per share (in dollar per share)	$ (1.23)	$ (11.85)	$ (2.82)	$ 7.80	$ (0.32)	$ (0.73)	$ 1.24	$ (3.65)	$ (8.12)	$ (3.45)

Amount of expense for allocation of cost of tangible and intangible assets over their useful lives, and reduction in quantity of natural resource due to consumption directly used in production of good and rendering of service.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03(b)(2))
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The amount of net income or loss for the period per each share in instances when basic and diluted earnings per share are the same amount and reported as a single line item on the face of the financial statements. Basic earnings per share is the amount of net income or loss for the period per each share of common stock or unit outstanding during the reporting period. Diluted earnings per share includes the amount of net income or loss for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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Aggregate revenue less cost of goods and services sold or operating expenses directly attributable to the revenue generation activity.

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Amount, after deduction of tax, noncontrolling interests, dividends on preferred stock and participating securities; of income (loss) available to common shareholders.

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Amount, including tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value-added and excise.

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