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Note 10 - Shareholders' Equity and Share-Based Compensation - Summary of Share-based Compensation (Details) - USD ($) $ in Thousands	12 Months Ended
	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

X

- Definition

Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

+ References

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-Publisher FASB
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-Topic 718
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