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Note 7 - Fair Value of Financial Assets and Liabilities (Tables)
9 Months Ended
Sep. 29, 2012
Fair Value, Assets Measured on Recurring Basis [Table Text Block]
Fair Value Measurements Using
 

Quoted Prices in
Active Markets for
Identical Assets
(Level 1)

Significant
Other
Observable
Inputs
(Level 2)

Significant
Unobservable
Inputs
(Level 3)

Total

                                 

Available-for-sale securities

  $ 10,819   $   $   $ 10,819

Total

  $ 10,819   $   $   $ 10,819
Fair Value Measurements Using
 

Quoted Prices in
Active Markets for
Identical Assets
(Level 1)

Significant
Other
Observable
Inputs
(Level 2)

Significant
Unobservable
Inputs
(Level 3)

Total

                                 

Available-for-sale securities

  $ 8,867   $   $   $ 8,867

Short-term investments

    13,997             13,997

Total

  $ 22,864   $   $   $ 22,864