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INCOME TAXES - Operating Loss Carryovers and Unrecognized Tax Benefits (Details) - USD ($) | 3 Months Ended | 12 Months Ended
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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. 31, 2017 | Dec. 29, 2017
Income taxes |  |  |  |  |  |  |  |  |  |  |  |
U.S. federal statutory rate (as a percent) |  |  |  |  |  |  |  |  | 21.00% | 21.00% | 35.00% | 34.00%
Valuation reserve related to California net operating losses | $ 86,000 |  |  |  | $ 86,000 |  |  |  | $ 86,000 | $ 86,000 |  |
Unrecognized tax benefits |  |  |  |  | 142,000 |  |  |  |  | 142,000 |  | $ 424,000
Income tax expense (benefit) | $ 1,188,000 | $ (376,000) | $ (70,000) | $ (927,000) | (93,000) | $ 1,597,000 | $ 869,000 | $ (242,000) | $ (185,000) | 2,131,000 |  | $ 1,562,000
Reconciliation of unrecognized tax benefits |  |  |  |  |  |  |  |  |  |  |  |
Unrecognized Tax Benefits, Increase Resulting from Prior Period Tax Positions |  |  |  |  |  |  |  |  |  | 5,000 |  |
Unrecognized Tax Benefits, Decrease Resulting from Prior Period Tax Positions |  |  |  |  |  |  |  |  |  | 287,000 |  |
Maximum |  |  |  |  |  |  |  |  |  |  |  |
Income taxes |  |  |  |  |  |  |  |  |  |  |  |
U.S. federal statutory rate (as a percent) |  |  |  |  |  |  |  |  |  |  |  | 35.00%
Federal |  |  |  |  |  |  |  |  |  |  |  |
Income taxes |  |  |  |  |  |  |  |  |  |  |  |
Operating loss carryovers |  |  |  |  | 72,700,000 |  |  |  |  | 72,700,000 |  |
State |  |  |  |  |  |  |  |  |  |  |  |
Income taxes |  |  |  |  |  |  |  |  |  |  |  |
Operating loss carryovers |  |  |  |  | $ 58,000,000 |  |  |  |  | $ 58,000,000 |  |

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