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EARNINGS PER SHARE (EPS) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 27, 2019	Sep. 27, 2019	Jun. 28, 2019	Mar. 29, 2019	Dec. 28, 2018	Sep. 28, 2018	Jun. 29, 2018	Mar. 30, 2018	Dec. 27, 2019	Dec. 28, 2018	Dec. 29, 2017
Earnings per share
Net income	$ 3,202	$ 416	$ 1,640	$ (417)	$ 1,201	$ 3,311	$ 3,315	$ 2,203	$ 4,841	$ 10,030	$ 12,129
Weighted-average common shares outstanding (in shares)	11,357,000	11,217,000	11,100,000	10,974,000	10,662,000	8,844,000	8,796,000	8,753,000	11,162,000	9,264,000	8,541,000
Effect of dilutive stock options and restricted stock awards (in shares)									604,000	499,000	614,000
Weighted-average common shares outstanding-diluted (in shares)	11,913,000	11,789,000	11,679,000	10,974,000	11,217,000	9,343,000	9,288,000	9,185,000	11,766,000	9,763,000	9,155,000
Earnings per share:
Basic	$ 0.28	$ 0.04	$ 0.15	$ (0.04)	$ 0.11	$ 0.37	$ 0.38	$ 0.25	$ 0.43	$ 1.08	$ 1.42
Diluted	$ 0.27	$ 0.04	$ 0.14	$ (0.04)	$ 0.11	$ 0.35	$ 0.36	$ 0.24	$ 0.41	$ 1.03	$ 1.32
Stock options
Anti-dilutive securities excluded from the computation of earnings per share
Number of awards excluded from calculation of dilutive potential common shares (in shares)									155,300	247,800	114,600

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