Note 10 - Shareholders' Equity and Share-Based Compensation (Details Textual) $ / shares in Units, $ in Thousands	12 Months Ended
May 01, 2021 USD ($) $ / shares shares	May 02, 2020 USD ($) shares	Apr. 27, 2019 USD ($) shares
Common Stock, Shares Authorized and Undesignated (in shares)	120,000,000
Common Stock, Shares Authorized (in shares)	115,000,000	115,000,000
Common Stock, Shares Undesignated (in shares)	5,000,000
Common Share Purchase Right Per Common Share, Ratio	1
Common Share Rights Exercise, Period, Option One (Day)	10 days
Sale of Stock, Percentage of Ownership after Transaction	20.00%
Common Share Rights Exercise, Period, Option Two (Year)	10 years
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)	3 years 1 month 6 days
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number (in shares)	1,478,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value \| $	$ 0	$ 0	$ 98
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value \| $	$ 451	$ 566	$ 667
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in shares)	2,868,000
Stock Issued During Period, Shares, Employee Stock Purchase Plans (in shares)	170,000	453,000	241,000
Share-based Payment Arrangement, Nonvested Award, Excluding Option, Cost Not yet Recognized, Amount \| $	$ 2,832
Proceeds from Stock Options Exercised \| $	0	$ 0	$ 1,318
Share-based Payment Arrangement, Expense, Tax Benefit \| $	$ 70	92	52
Employee Stock Purchase Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)	1 year
Share-based Compensation Arrangement by Share-based Payment Award, Maximum Employee Subscription Rate	15.00%
Share-based Compensation Arrangement by Share-based Payment Award, Discount from Market Price, Offering Date	85.00%
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in shares)	4,000,000
Common Stock, Capital Shares Reserved for Future Issuance (in shares)	809,000
Share-based Payment Arrangement, Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year)	10 years
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)	5 years
Share-based Payment Arrangement, Option [Member] \| Independent Directors [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year)	7 years
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)	1 year
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value \| $	$ 1,293	$ 1,415	$ 1,530
Restricted Stock [Member] \| Independent Directors [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)	1 year
Restricted Stock [Member] \| Employees [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)	5 years
Restricted Stock and Restricted Stock Units [Member]
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total \| $	$ 1,787
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)	2 years 7 months 6 days
In Money Options [Member]
Share-based Payment Arrangement, Option, Exercise Price Range, Upper Range Limit (in dollars per share) \| $ / shares	$ 6.17
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number (in shares)	0
Preferred Share Purchase Right [Member]
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right (in shares)	0.001
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) \| $ / shares	$ 25

Represents the purchase right of each common share.

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Exercise price per share or per unit of warrants or rights outstanding.

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Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Amount of cost to be recognized for nonvested award under share-based payment arrangement. Excludes share and unit options.

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Amount of tax benefit for recognition of expense of award under share-based payment arrangement.

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Amount of cash inflow from exercise of option under share-based payment arrangement.

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Percentage of subsidiary's or equity investee's stock owned by parent company after stock transaction.

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Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash.

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The highest percentage of annual salary that an employee is permitted to utilize with respect to the plan.

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The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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The ceiling of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

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Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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