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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Earnings Per Share (Details) - shares	3 Months Ended
	Mar. 28, 2021	Mar. 29, 2020
Schedule of Weighted Average Number of Shares, Diluted [Line Items]
Basic (shares)	10,332,815	10,308,445
Effect of dilutive securities:
Weighted-average number of diluted common shares outstanding	10,394,839	10,382,999
Antidilutive securities excluded from computation of earnings per share, amount	449,212	423,150
Stock options and restricted stock
Effect of dilutive securities:
Stock options and restricted stock	62,024	61,859
Antidilutive securities excluded from computation of earnings per share, amount	423,350	423,150
Warrant
Effect of dilutive securities:
Warrants	0	12,695
Antidilutive securities excluded from computation of earnings per share, amount	25,862	0

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Schedule of Weighted Average Number of Shares, Diluted [Line Items]

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Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
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-Section 50
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Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of call options and warrants using the treasury stock method.

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Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of share based payment arrangements using the treasury stock method.

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The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.

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