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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details Textual) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 27, 2021 USD ($) | Jun. 28, 2020 | Jun. 27, 2021 USD ($) segment | Jun. 28, 2020 | Dec. 27, 2020 USD ($)
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Accumulated depreciation and amortization, property, plant, and equipment | $ 4.7 |  | $ 4.7 |  | $ 4.3
Deposit contracts, assets | $ 3.9 |  | $ 3.9 |  | $ 3.8
Number of reportable segments | segment |  |  | 3 |  |
Effective income tax rate reconciliation, percent | 16.00% | 25.90% | 16.10% | 22.80% |
Operating loss carryforwards | $ 5.9 |  | $ 5.9 |  |
Goodwill, expected tax deductible amount | $ 32.0 |  | $ 32.0 |  |
Minimum |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Renewal term | 3 years |  | 3 years |  |
Useful life |  |  | 3 years |  |
Maximum |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Renewal term | 10 years |  | 10 years |  |
Useful life |  |  | 10 years |  |

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