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Note 10 - Shareholders' Equity and Share-Based Compensation -Stock Option (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	May 01, 2021	May 02, 2020	May 01, 2021
Outstanding, shares (in shares)	2,121
Outstanding, weighted average exercise price per share (in dollars per share)	$ 9.96
Outstanding, beginning of period, weighted average remaining contractual life (Year)	4 years 9 months 29 days	4 years 4 months 17 days
Granted, shares (in shares)	412
Granted, weighted average exercise price per share (in dollars per share)	$ 4.11
Canceled or forfeited, shares (in shares)	(306)
Canceled or forfeited, weighted average exercise price per share (in dollars per share)	$ 12.48
Outstanding, shares (in shares)	2,121	2,121	2,227
Outstanding, weighted average exercise price per share (in dollars per share)	$ 8.53	$ 9.96
Outstanding, aggregate intrinsic value			$ 843
Shares vested and expected to vest (in shares)	2,190
Shares vested and expected to vest (in dollars per share)	$ 8.58
Shares vested and expected to vest (Year)	4 years 9 months 3 days
Shares vested and expected to vest			$ 792
Exercisable at May 1, 2021 (in shares)			1,478
Exercisable at May 1, 2021 (in dollars per share)			$ 9.83
Exercisable at May 1, 2021 (Year)	3 years

X

- Definition

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.

+ References

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For presentations that combine terminations, the number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan or that expired.

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Weighted average price of options that were either forfeited or expired.

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Gross number of share options (or share units) granted during the period.

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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Number of options outstanding, including both vested and non-vested options.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Amount by which current fair value of underlying stock exceeds exercise price of fully vested and expected to vest exercisable or convertible options. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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Number of fully vested and expected to vest options outstanding that can be converted into shares under option plan. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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Weighted-average exercise price, at which grantee can acquire shares reserved for issuance, for fully vested and expected to vest options outstanding. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Weighted average remaining contractual term for fully vested and expected to vest options outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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