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ACCOUNTS RECEIVABLE (Details) (USD $)
 12 Months Ended
Dec. 27, 2013
Dec. 28, 2012
Dec. 30, 2011
Accounts receivable      
Gross $ 23,187,000 $ 25,647,000  
Allowance for doubtful accounts (385,000) (303,000) (421,000)
Net 22,802,000 25,344,000  
Movements in the allowance for doubtful accounts      
Balance as of the beginning of the year 303,000 421,000 959,000
Provision for doubtful accounts 189,000 220,000 219,000
Write-offs of uncollectible accounts (107,000) (341,000) (765,000)
Recoveries of accounts written off   3,000 8,000
Balance as of the end of the year 385,000 303,000 421,000
Accounts Receivable | Credit concentration risk
      
Movements in the allowance for doubtful accounts      
Number of clients representing concentration risk on outstanding receivables 1    
Percentage of outstanding receivables accounted for by one client 26.00% 34.00%  
Billed
      
Accounts receivable      
Gross 12,879,000 15,145,000  
Unbilled
      
Accounts receivable      
Gross 9,635,000 9,860,000  
Contract retentions
      
Accounts receivable      
Gross $ 673,000 $ 642,000