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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 |

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