Note 7 - Income Taxes (Details Textual) - USD ($)	12 Months Ended
Apr. 27, 2019	Apr. 28, 2018	Apr. 29, 2017	Apr. 30, 2016
Unrecognized Tax Benefits, Ending Balance	$ 1,868,000	$ 1,733,000	$ 1,743,000	$ 1,678,000
Unrecognized Tax Benefits, Decrease Resulting from Current Period Tax Positions	116,000
Changes in IncomeTax if All Uncertain Tax Positions Prevail	1,500,000
Unrecognized Tax Benefits, Interest on Income Taxes Accrued	253,000
Unrecognized Tax Benefits, Period Increase (Decrease), Total	$ 15,000
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	21.00%	30.40%	35.00%
Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability		$ (4,300,000)

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

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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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.

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Amount of unrecognized tax benefits.

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

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

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

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