Note 7 - Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Apr. 27, 2019	Apr. 28, 2018
Deferred tax assets:
Accrued expenses and other	$ 3,705	$ 2,900
Inventory and amortizable assets	265	331
Total deferred tax assets	3,970	3,231
Deferred tax liabilities:
Property	18,505	14,858
Intangibles and other	1,452	2,875
Total deferred tax liabilities	19,957	17,733
Net deferred tax liabilities	$ 15,987	$ 14,502