INCOME TAXES - Deferred Tax Assets (Details) - USD ($) $ in Thousands	Dec. 29, 2019	Dec. 30, 2018
Income Taxes
Deferred rent		$ 411
Federal net operating loss carry-forwards	$ 1,980	1,812
State net operating loss carry-forwards	1,993	4,130
Intangible property basis difference	(7)	131
Financing lease obligation		299
Tax credit carryover	2,581	2,164
Accrued expenses	168	205
Stock-based compensation	187	103
Deferred revenue	693	666
Lease reserve	8,060	107
Accrued and deferred compensation	53	36
Contribution carryover	50	46
Transaction and organization costs	121
Inventories	10	5
Total deferred tax assets	15,889	10,115
Property and equipment basis difference	(755)	(568)
Inventories	(146)	(83)
Prepaid expenses	(365)	(236)
Right of use asset	(6,664)
Total deferred tax liability	(7,930)	(887)
Net deferred tax assets	7,959	9,228
Valuation allowance	(1,313)	(3,481)
Deferred tax asset, net	$ 6,646	$ 5,747