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Schedule II - VALUATION AND QUALIFYING ACCOUNTS (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 28, 2013
Dec. 29, 2012
Dec. 31, 2011
Allowance for Doubtful Accounts [Member]
      
Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at beginning of period $ 82 $ 117 $ 63
Charged to costs and expenses 255 (3) 81
Deductions – write-offs of accounts (44) (32) (27)
Balance at end of period 293 82 117
Valuation Allowance for Deferred Tax Assets [Member]
      
Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at beginning of period 10,229 8,142 7,002
Charged to costs and expenses 1,436 2,087 1,140
Deductions – write-offs of accounts 0 0 0
Balance at end of period $ 11,665 $ 10,229 $ 8,142