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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Earnings Per Share (Details) - shares	3 Months Ended		6 Months Ended
	Jun. 28, 2020	Jun. 30, 2019	Jun. 28, 2020	Jun. 30, 2019
Schedule of Weighted Average Number of Shares, Diluted [Line Items]
Basic (shares)	10,306,986	10,232,588	10,307,715	10,231,025
Effect of dilutive securities:
Weighted-average number of diluted common shares outstanding	10,306,986	10,362,038	10,307,715	10,380,195
Antidilutive securities excluded from computation of earnings per share, amount	547,109	239,750	449,012	239,750
Stock options and restricted stock
Effect of dilutive securities:
Stock options and restricted stock	0	89,833	0	105,156
Antidilutive securities excluded from computation of earnings per share, amount	521,247	239,750	423,150	239,750
Warrant
Effect of dilutive securities:
Warrants	0	39,617	0	44,014
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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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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