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Note 5 - Short-term Investments (Tables) | 12 Months Ended
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Dec. 31, 2015
Notes Tables |
Schedule of Available-for-sale Securities Reconciliation [Table Text Block] |
|  | Amortized |  |  | Fair |  |  | Unrealized |
|  | Cost |  |  | Value |  |  | Gain/(Loss) |
|  | (In thousands) |
Commercial paper |  | $ | 23,982 |  |  | $ | 23,984 |  |  | $ | 2 |
Corporate bonds |  |  | 21,717 |  |  |  | 21,693 |  |  |  | (24 | )
Certificates of deposit |  |  | 961 |  |  |  | 961 |  |  |  | – |
Balances as of December 28, 2014 |  | $ | 46,660 |  |  | $ | 46,638 |  |  | $ | (22 | )

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