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ACQUISITIONS (Supplemental Unaudited Pro Forma Information) (Details) - L.J. Kushner & Associates, L.L.C. - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 27, 2021	Jun. 28, 2020	Jun. 27, 2021	Jun. 28, 2020
Business Acquisition [Line Items]
Revenues	$ 74,392	$ 63,235	$ 142,339	$ 141,447
Gross profit	21,783	17,280	40,763	39,102
Net income (loss)	$ 3,443	$ (4,744)	$ 4,199	$ (3,193)
Income (Loss) per share:
Basic pro forma (in usd per share)	$ 0.33	$ (0.46)	$ 0.41	$ (0.31)
Diluted pro forma (in usd per share)	$ 0.33	$ (0.46)	$ 0.40	$ (0.31)

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Business Acquisition, Pro Forma Gross Profit

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The pro forma basic net income per share for a period as if the business combination or combinations had been completed at the beginning of a period.

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