SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Schedule of Weighted Average Number of Shares) (Details) - shares	3 Months Ended								12 Months Ended
	Dec. 27, 2020	Sep. 27, 2020	Jun. 28, 2020	Mar. 29, 2020	Dec. 29, 2019	Sep. 29, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 27, 2020	Dec. 29, 2019	Dec. 30, 2018
Schedule of Weighted Average Number of Shares, Diluted [Line Items]
Weighted-average number of basic common shares outstanding	10,318,053	10,312,939	10,306,986	10,308,445	10,253,085	10,239,126	10,232,588	10,229,462	10,311,606	10,238,565	9,577,498
Weighted-average number of diluted common shares outstanding (in shares)	10,334,478	10,326,493	10,306,986	10,382,999	10,370,996	10,343,673	10,362,038	10,404,355	10,338,029	10,350,775	9,808,080
Stock options and restricted stock
Schedule of Weighted Average Number of Shares, Diluted [Line Items]
Effect of dilutive securities (in shares)									26,423	90,681	186,995
Warrant
Schedule of Weighted Average Number of Shares, Diluted [Line Items]
Effect of dilutive securities (in shares)									0	21,529	43,587