Note 11 - Collaborative Arrangement (Details Textual) - USD ($) $ in Thousands |
3 Months Ended | |
|---|---|---|
Apr. 29, 2017 |
Apr. 30, 2016 |
|
| Research and Development Expense | $ 18,169 | $ 19,155 |
| Collaborative Arrangement, Product [Member] | Telechips Inc [Member] | ||
| Collaborative Arrangement, Percentage of Net Profit Receivable as Marketing Service Fee | 50.00% | |
| Net Loss from Collaborative Arrangement | $ 100 | |
| Research and Development Expense | $ 500 | |