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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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