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Note 8 - Income Taxes - Reconciliation of Income Tax Rate (Details)
12 Months Ended
May 02, 2020
Apr. 27, 2019
Apr. 28, 2018
Apr. 29, 2017
Statutory federal income tax rate 21.00% 21.00% 30.40% 35.00%
State income taxes, net of federal benefit 2.90% 2.90% 2.40%  
Domestic manufacturing deduction benefit 0.00% 0.00% (2.40%)  
Re-measurement of deferred taxes 0.00% 0.00% (2.90%)  
Other differences (6.00%) (5.00%) (4.00%)  
Effective income tax rate 23.30% 23.40% 27.10%