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Note 4. Short-Term Investments (Tables) | 3 Months Ended
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Mar. 30, 2014
Investments, Debt and Equity Securities [Abstract] |
Schedule of Available-for-sale Securities Reconciliation [Table Text Block] |
|  | Amortized Cost |  |  | Fair Value |  |  | Unrealized Gain/(Loss) |
March 30, 2014 |  |  |  |  |  |  |  |  |  |  |  |
Commercial paper |  | $ | 29,946 |  |  | $ | 29,943 |  |  | $ | (3 | )
Corporate bonds |  |  | 15,873 |  |  |  | 15,864 |  |  |  | (9 | )
Certificates of deposit |  |  | 2,600 |  |  |  | 2,598 |  |  |  | (2 | )
Balances at March 30, 2014 |  | $ | 48,419 |  |  | $ | 48,405 |  |  | $ | (14 | )
December 29, 2013 |  |  |  |  |  |  |  |  |  |  |  |
Commercial paper |  | $ | 21,986 |  |  | $ | 21,993 |  |  | $ | 7 |
Corporate bonds |  |  | 27,113 |  |  |  | 27,106 |  |  |  | (7 | )
Balances at December 29, 2013 |  | $ | 49,099 |  |  | $ | 49,099 |  |  | $ | — |

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- Definition Tabular disclosure of the reconciliation of available-for-sale securities from cost basis to fair value. + References No definition available. + Details
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