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Note 3 - Short-term Investments (Tables) | 6 Months Ended
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Jun. 28, 2015
Investments, Debt and Equity Securities [Abstract] |
Schedule of Available-for-sale Securities Reconciliation [Table Text Block] |
|  | Amortized Cost |  |  | Fair Value |  |  | Unrealized Gain/(Loss) |
June 28, 2015 |  |  |  |  |  |  |  |  |  |  |  |
Commercial paper |  | $ | 6,989 |  |  | $ | 6,988 |  |  | $ | (1 | )
Corporate bonds |  |  | 33,624 |  |  |  | 33,605 |  |  |  | (19 | )
Balances at June 28, 2015 |  | $ | 40,613 |  |  | $ | 40,593 |  |  | $ | (20 | )
December 2 8, 201 4 |  |  |  |  |  |  |  |  |  |  |  |
Commercial paper |  | $ | 23,982 |  |  | $ | 23,984 |  |  | $ | 2 |
Corporate bonds |  |  | 21,717 |  |  |  | 21,693 |  |  |  | (24 | )
Certificates of deposit |  |  | 961 |  |  |  | 961 |  |  |  | — |
Balances at December 28, 2014 |  | $ | 46,660 |  |  | $ | 46,638 |  |  | $ | (22 | )

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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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