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