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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Earnings Per Share (Details) - shares	3 Months Ended		9 Months Ended
	Sep. 27, 2020	Sep. 29, 2019	Sep. 27, 2020	Sep. 29, 2019
Schedule of Weighted Average Number of Shares, Diluted [Line Items]
Basic (shares)	10,312,939	10,239,126	10,309,457	10,233,725
Effect of dilutive securities:
Weighted-average number of diluted common shares outstanding	10,326,493	10,343,673	10,309,457	10,365,871
Antidilutive securities excluded from computation of earnings per share, amount	632,419	306,750	445,712	306,750
Stock options and restricted stock
Effect of dilutive securities:
Stock options and restricted stock	13,554	69,684	0	90,853
Antidilutive securities excluded from computation of earnings per share, amount	606,557	306,750	419,850	306,750
Warrant
Effect of dilutive securities:
Warrants	0	34,863	0	41,293
Antidilutive securities excluded from computation of earnings per share, amount	25,862	0	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
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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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