Note 7 - Income Taxes (Details Textual) - USD ($)	12 Months Ended
Apr. 29, 2017	Apr. 30, 2016	May 02, 2015	May 03, 2014
Unrecognized Tax Benefits	$ 1,743,000	$ 1,678,000	$ 1,801,000	$ 2,123,000
Unrecognized Tax Benefits, Decrease Resulting from Current Period Tax Positions	66,000
Changes in IncomeTax if All Uncertain Tax Positions Prevail	1,200,000
Unrecognized Tax Benefits, Interest on Income Taxes Accrued	239,000
Unrecognized Tax Benefits, Period Increase (Decrease)	$ 12,000

The total amount of future income tax change that would occur if all uncertain tax positions prevail.

No definition available.

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- Definition

Amount of unrecognized tax benefits.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 15A
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=84230637&loc=SL6600010-109319

+ Details

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- Definition

Amount of decrease in unrecognized tax benefits resulting from tax positions that have been or will be taken in current period tax return.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 15A
-Subparagraph (a)(2)
-URI http://asc.fasb.org/extlink&oid=84230637&loc=SL6600010-109319

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- Definition

Amount of interest expense accrued for an underpayment of income taxes.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 15
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32718-109319

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- Definition

Amount of increase (decrease) in unrecognized tax benefits attributable to uncertain tax positions taken in tax returns.

+ References

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