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Note 10 - Shareholders' Equity and Share-Based Compensation - Summary of Share-based Compensation (Details) - USD ($) $ in Thousands | 12 Months Ended
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May 01, 2021 | May 02, 2020 | Apr. 27, 2019
Share-based compensation | $ 2,067 | $ 2,265 | $ 2,479
Share-based compensation expense | 2,067 | 2,265 | 2,479
Cost of Sales [Member] |  |  |
Share-based compensation expense | 472 | 514 | 578
Selling and Marketing Expense [Member] |  |  |
Share-based compensation expense | 484 | 572 | 625
General and Administrative Expense [Member] |  |  |
Share-based compensation expense | 678 | 717 | 772
Research and Development Expense [Member] |  |  |
Share-based compensation expense | 433 | 462 | 504
Share-based Payment Arrangement, Option [Member] |  |  |
Share-based compensation | 450 | 492 | 593
Restricted Stock and Restricted Stock Units [Member] |  |  |
Share-based compensation | 1,203 | 1,341 | 1,446
Employee Stock [Member] |  |  |
Share-based compensation | $ 414 | $ 432 | $ 440

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