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Note 5. Short-Term Investments (Tables)
9 Months Ended
Sep. 29, 2013
Investments, Debt and Equity Securities [Abstract]  
Schedule of Available-for-sale Securities Reconciliation [Table Text Block]
   

Amortized Cost

   

Fair Value

   

Unrealized Gain/(Loss)

 

Commercial paper

  $ 19,984     $ 19,987     $ 3  

Corporate bonds

    28,976       28,964       (12)  

Balances at September 29, 2013

  $ 48,960     $ 48,951     $ (9)