The number of authorized and undesignated common and preferred shares.

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Represents the purchase right of each common share.

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Represents period of option one for common shares exercise period.

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Represents option two of common share rights exercise period.

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The number of undesignated shares.

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

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Number of securities into which each warrant or right may be converted. For example, but not limited to, each warrant may be converted into two shares.

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No definition available.

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Aggregate number of common shares reserved for future issuance.

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The maximum number of common shares permitted to be issued by an entity's charter and bylaws.

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Amount of cost not yet recognized for nonvested award under share-based payment arrangement.

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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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The maximum number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) permitted to be issued by an entity's charter and bylaws.

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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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No definition available.

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Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.

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Discount rate from fair value on offering date that participants pay for shares.

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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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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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No definition available.

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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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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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- Definition

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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Fair value of options vested. Excludes equity instruments other than options, for example, but not limited to, share units, stock appreciation rights, restricted stock.

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Number of shares issued during the period as a result of an employee stock purchase plan.

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Shareholders' Equity and Share-Based Compensation (Details Textual) $ / shares in Units, $ in Thousands	12 Months Ended
	Apr. 30, 2022 USD ($) $ / shares shares	May 01, 2021 USD ($) shares	May 02, 2020 USD ($) shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock, shares authorized and undesignated (in shares)	120,000,000
Common stock, shares authorized (in shares)	115,000,000	115,000,000
Preferred stock, shares authorized (in shares)	50,000	50,000
Common stock, shares undesignated (in shares)	4,950,000
Number of preferred share purchase right	1
Common share rights exercise, period	10 days
Sale of stock, percentage of ownership after transaction	20.00%
Common share rights exercise, period	10 years
Share-based compensation arrangement by share-based payment award, number of shares available for grant (in shares)	2,456,000
Share-based payment arrangement, nonvested award, cost not yet recognized, amount \| $	$ 1,772
Share-based payment arrangement, nonvested award, cost not yet recognized	2 years 8 months 15 days
Exercisable shares (in shares)	1,371,000
Option, exercise price range, upper range limit (in dollars per share) \| $ / shares	$ 3.35
Exercised, aggregate intrinsic value \| $	$ 2	$ 0	$ 0
Fair value of stock potions vested \| $	$ 465	$ 451	$ 566
Stock issued during period, shares, employee stock purchase plans (in shares)	310,000	170,000	453,000
Share-based compensation expense \| $	$ 2,862
Proceeds from stock options exercised \| $	8	$ 0	$ 0
Share-based payment arrangement, expense, tax benefit \| $	$ (47)	70	92
Employee Stock Purchase Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation arrangement by share-based payment award, award vesting period	1 year
Share-based compensation arrangement by share-based payment award, number of shares available for grant (in shares)	4,000,000
Maximum employee subscription rate	15.00%
Discount from market price, offering date	85.00%
Common stock, capital shares reserved for future issuance (in shares)	705,000
Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation arrangement by share-based payment award, expiration period	10 years
Share-based compensation arrangement by share-based payment award, award vesting period	5 years
Stock options \| Independent Directors
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation arrangement by share-based payment award, expiration period	7 years
Share-based compensation arrangement by share-based payment award, award vesting period	1 year
Restricted stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value of restricted stock vested \| $	$ 1,203	$ 1,293	$ 1,415
Restricted stock \| Independent Directors
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation arrangement by share-based payment award, award vesting period	1 year
Restricted stock \| Employees
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation arrangement by share-based payment award, award vesting period	5 years
In money options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercisable shares (in shares)	0
Preferred Share Purchase Right
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of securities called by each warrant or right (in shares)	0.001
Initial exercise price (in dollars per share) \| $ / shares	$ 20