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Note 9 - Stock-based Compensation (Tables) | 12 Months Ended
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Apr. 27, 2019
Notes Tables |
Share-based Payment Arrangement, Option, Activity [Table Text Block] |
|  | Number of Shares |  |  | Price (a) |
Options outstanding, beginning of year |  |  | 344,945 |  |  |  | $10.84 |
Granted |  |  | 9,000 |  |  |  | 40.03 |
Exercised |  |  | (27,300 | ) |  |  | 16.70 |
Cancelled |  |  | (4,200 | ) |  |  | 14.17 |
Options outstanding, end of year |  |  | 322,445 |  |  |  | 11.14 |
Options exercisable, end of year |  |  | 230,259 |  |  |  | 9.16 |

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