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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details Textual) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 30, 2018 | Dec. 31, 2017 | Dec. 25, 2016 | Mar. 31, 2019
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Fiscal period, length | 364 days | 371 days | 364 days |
Deposits | $ 2,900,000 | $ 2,700,000 |  |
Goodwill, impairment loss | 0 | 0 | $ 0 |
Advertising expense | 1,900,000 | $ 1,500,000 | $ 1,300,000 |
Tax Cuts and Jobs Act of 2017, change in tax rate, deferred tax asset, income tax expense | $ 3,300,000 |  |  |
Minimum |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Property, plant and equipment, useful life | 5 years |  |  |
Finite-lived intangible asset, useful life | 3 years |  |  |
Maximum |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Property, plant and equipment, useful life | 7 years |  |  |
Finite-lived intangible asset, useful life | 10 years |  |  |
Forecast |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Operating lease, right-of-use asset |  |  |  | $ 4,000,000
Operating lease, liability |  |  |  | $ 4,000,000

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