BASIS OF PRESENTATION - Net Income Per Common Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 29, 2020	Mar. 31, 2019
Net income (loss) per common share
Net income attributable to shareholders	$ 13,707	$ 82
Weighted average shares outstanding - basic	9,121,000	9,085,000
Basic net income per share attributable to shareholders	$ 1.50	$ 0.01
Weighted average shares outstanding - diluted	9,202,000	9,189,000
Diluted net income per share attributable to shareholders	$ 1.49	$ 0.01
Anti-dilutive shares excluded from computation of diluted net income per share	228,197	179,000