BASIS OF PRESENTATION - Net Income per Common Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 04, 2021	Jun. 28, 2020	Jul. 04, 2021	Jun. 28, 2020
Earnings Per Share [Abstract]
Net income	$ 15,786	$ (6,252)	$ 16,585	$ 7,455
Weighted average shares outstanding - basic	9,304,000	9,138,000	9,256,000	9,132,000
Weighted average shares outstanding - diluted	9,615,000	9,138,000	9,567,000	9,132,000
Basic net income per common share	$ 1.70	$ (0.68)	$ 1.79	$ 0.82
Earnings Per Share, Diluted	$ 1.64	$ (0.68)	$ 1.73	$ 0.82
Anti-dilutive shares excluded from computation of diluted net income per share			250	299,617