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Note 8 - Stock-based Compensation (Tables) | 12 Months Ended
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Apr. 28, 2018
Notes Tables |
Share-based Compensation, Stock Options, Activity [Table Text Block] |
|  | Number of Shares |  |  | Price (a) |
Options outstanding, beginning of year |  |  | 383,595 |  |  | $ | 11.47 |
Granted |  |  | 500 |  |  |  | 29.61 |
Exercised |  |  | (34,650 | ) |  |  | 16.15 |
Cancelled |  |  | (4,500 | ) |  |  | 17.59 |
Options outstanding, end of year |  |  | 344,945 |  |  |  | 10.84 |
Options exercisable, end of year |  |  | 209,579 |  |  |  | 8.49 |

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