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Note 10 - Shareholders' Equity and Share-Based Compensation - Nonvested Restricted Stock and Restricted Stock Units (Details) - Restricted Stock and Restricted Stock Units [Member] - $ / shares	12 Months Ended
	May 01, 2021	May 02, 2020	Apr. 27, 2019
Outstanding at beginning of year, number of nonvested shares (in shares)	449	444	437
Outstanding, Weighted Average Grant Date Fair Value (in dollars per share)	$ 7.16	$ 7.58	$ 8.48
Granted, number of nonvested shares (in shares)	223	186	181
Granted, Weighted Average Grant Date Fair Value (in dollars per share)	$ 3.92	$ 7.03	$ 6.79
Vested, number of nonvested shares (in shares)	(176)	(173)	(169)
Vested, Weighted Average Grant Date Fair Value (in dollars per share)	$ 7.27	$ 8.10	$ 9.05
Forfeited, number of nonvested shares (in shares)	(16)	(8)	(5)
Forfeited, Weighted Average Grant Date Fair Value (in dollars per share)	$ 7.00	$ 7.37	$ 7.74
Outstanding at end of year (in shares)	480	449	444
Outstanding, Weighted Average Grant Date Fair Value (in dollars per share)	$ 5.62	$ 7.16	$ 7.58

X

- Definition

The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(iv)(3)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

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- Definition

Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

+ References

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- Definition

The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

+ References

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- Definition

The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

+ References

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- Definition

The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

+ References

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- Definition

Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options.

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-Publisher FASB
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The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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- Definition

The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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