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LEASES - Impact of Adoption (Details) - USD ($)
 12 Months Ended
Dec. 27, 2019
Dec. 28, 2018
Dec. 29, 2017
Operating leases:      
Right-of-use assets $ 22,297,000    
Lease liability $ 5,550,000    
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List] Lease liability    
Lease liability, less current portion $ 18,411,000    
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List] Lease liability, less current portion    
Total lease obligations $ 23,961,000    
Operating Lease, Liability, Statement of Financial Position [Extensible List] Total lease obligations    
Finance leases (included in equipment and leasehold improvements, net):      
Equipment and leasehold improvements, gross $ 27,334,000 $ 19,783,000  
Accumulated depreciation (15,283,000) (11,785,000)  
Total equipment and leasehold improvements, net 12,051,000 7,998,000  
Finance lease obligations 375,000 320,000  
Finance lease obligations, less current portion 191,000 224,000  
Total lease obligations $ 566,000    
Operating Leases 4 years 7 months 2 days    
Finance Leases 1 year 5 months 19 days    
Operating Leases, discount rate 5.14%    
Finance Leases, discount rate 4.80%    
Opertaing lease, rent expense $ 6,190,000    
Operating Leases, Rent Expense, Net   $ 4,486,000 $ 3,624,000
Finance Leases      
Finance leases (included in equipment and leasehold improvements, net):      
Equipment and leasehold improvements, gross 1,957,000    
Accumulated depreciation (1,291,000)    
Total equipment and leasehold improvements, net $ 666,000