Note 4 - Stock-Based Compensation (Details) (USD $)	3 Months Ended
Jul. 27, 2013
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross	3,500
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price (in Dollars per share)	$ 6.53
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period	1,400
Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price (in Dollars per share)	$ 3.05
Share-based Compensation Arrangement By Share-based Payment Award, Options Cancelled During Period	3,800
Share-based Compensation Arrangement By Share-based Payment Award, Options Cancelled During Period, Weighted Average Excercise Price (in Dollars)	$ 14.41
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number	440,110
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price (in Dollars per share)	$ 6.79
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant	3,006,934

ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsCancelledDuringPeriod

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ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsCancelledDuringPeriodWeightedAverageExcercisePrice

+ References

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- Definition

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.

+ References

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- Definition

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

+ References

No definition available.

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

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-Topic 718

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-Subparagraph (c)(1)(i)-(ii)

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- Definition

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

+ References

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-Publisher FASB

-Name Accounting Standards Codification

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

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- Definition

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

+ References

No definition available.

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- Definition

Number of share options (or share units) exercised during the current period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Article 3

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-Publisher FASB

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-Topic 505

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-Number 210

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