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COMMITMENTS (Details) (USD $)
 12 Months Ended
Dec. 27, 2013
Dec. 28, 2012
Dec. 30, 2011
Future minimum rental payments under capital leases      
2014 $ 159,000    
2015 86,000    
2016 24,000    
Total future minimum lease payments 269,000    
Amount representing maintenance (48,000)    
Amount representing interest (7,000)    
Interest rate, minimum (as a percent) 3.25%    
Interest rate, maximum (as a percent) 3.75%    
Present value of net minimum lease payments under capital leases 214,000    
Less current portion 129,000 152,000  
Capital lease noncurrent 85,000 124,000  
Future minimum rental payments under non-cancelable operating leases      
2014 2,848,000    
2015 1,017,000    
2016 124,000    
Total future minimum lease payments 3,989,000    
Operating leases rental income or expense      
Rent expense and related charges for common area maintenance for all facility operating leases 3,405,000 3,615,000 3,627,000
Reconciliation of the liability for lease abandonment (recovery) expense      
Liability for abandoned leases as of the beginning of the year 162,000 327,000  
Lease abandonment expense, net 30,000 26,000 2,000
Lease payments on abandoned leases, net of sublease payments (189,000) (238,000)  
Other 119,000 47,000  
Liability for abandoned leases as of the end of the year 122,000 162,000 327,000
Employee Benefit Plans      
Maximum employee contribution as a percentage of compensation under 401 (k) Plan 50.00%    
Matching contributions by the company under 401(k) Plan 507,000 248,000 219,000
Bonus expense under discretionary bonus plan 262,000 258,000 1,602,000
Bonus expense included in accrued liabilities as of the balance sheet date 31,000 52,000  
Post Employment Health Benefits      
Unamortized compensation cost 0    
Present value of expected payments for health insurance coverage $ 137,000 $ 143,000