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Note 8 - Income Taxes (Details Textual) - USD ($) | 12 Months Ended
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May 02, 2020 | Apr. 27, 2019 | Apr. 28, 2018 | Apr. 29, 2017
Unrecognized Tax Benefits, Ending Balance | $ 1,974,000 | $ 1,868,000 | $ 1,733,000 | $ 1,743,000
Unrecognized Tax Benefits, Decrease Resulting from Current Period Tax Positions | 91,000 |  |  |
Changes in Income Tax if All Uncertain Tax Positions Prevail | 1,600,000 |  |  |
Unrecognized Tax Benefits, Interest on Income Taxes Accrued | 267,000 |  |  |
Unrecognized Tax Benefits, Period Increase (Decrease), Total | $ (15,000) |  |  |
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent | 21.00% | 21.00% | 30.40% | 35.00%
Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability |  |  | $ (4,300,000) |

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- Definition Percentage of domestic federal statutory tax rate applicable to pretax income (loss). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 6.I.Fact.4) -URI http://asc.fasb.org/extlink&oid=116825942&loc=d3e330036-122817 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 + Details
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- Definition Amount of income tax expense (benefit) from continuing operations attributable to an adjustment of a deferred tax liability or asset for enacted changes in tax laws or rates or a change in the tax status of the entity. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32639-109319 + Details
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