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DEBT (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 27, 2017
Feb. 04, 2015
Sep. 27, 2017
Sep. 28, 2016
Sep. 27, 2017
Sep. 28, 2016
Dec. 28, 2016
Debt Instrument [Line Items]              
Deemed landlord financing $ 13,162,000   $ 13,162,000   $ 13,162,000   $ 2,007,000
Interest costs incurred     (527,000) $ (89,000) (1,260,000) $ (267,000)  
Interest Expense     475,000 89,000 1,144,000 267,000  
Interest costs capitalized     51,000 $ 0 115,000 $ 0  
Notes payable              
Debt Instrument [Line Items]              
Notes payable 0   0   $ 0    
Letter of credit              
Debt Instrument [Line Items]              
Term to maturity         1 year    
Revolving Credit Facility | Line of credit              
Debt Instrument [Line Items]              
Maximum borrowing capacity   $ 50,000,000          
Current borrowing capacity   $ 20,000,000          
Term to maturity   5 years          
Amount available under revolving credit facility 19,317,000   19,317,000   $ 19,317,000    
Notes payable             $ 0
Revolving Credit Facility | Letter of credit | Line of credit              
Debt Instrument [Line Items]              
Maximum borrowing capacity   $ 10,000,000          
Current borrowing capacity $ 683,000   $ 683,000   $ 683,000    
Revolving Credit Facility | Minimum | Line of credit | London Interbank Offered Rate (LIBOR)              
Debt Instrument [Line Items]              
Basis spread on variable rate 2.30%            
Revolving Credit Facility | Minimum | Line of credit | Prime rate              
Debt Instrument [Line Items]              
Basis spread on variable rate 0.00%            
Revolving Credit Facility | Maximum | Line of credit | London Interbank Offered Rate (LIBOR)              
Debt Instrument [Line Items]              
Basis spread on variable rate 3.30%            
Revolving Credit Facility | Maximum | Line of credit | Prime rate              
Debt Instrument [Line Items]              
Basis spread on variable rate 0.80%