STOCK-BASED COMPENSATION (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 29, 2020	Mar. 31, 2019
Stock-based compensation
Shares available for grant	89,661
Stock-based compensation expense	$ 137	$ 83
Stock Options
Stock-based compensation
Stock-based compensation expense	72	60
Restricted Stock
Stock-based compensation
Stock-based compensation expense	$ 65	$ 23
Employees and Directors \| Stock Options
Stock-based compensation
Expiration period	10 years
Employees and Directors \| Minimum \| Stock Options
Stock-based compensation
Vesting period	2 years
Employees and Directors \| Maximum \| Stock Options
Stock-based compensation
Vesting period	5 years

Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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