Note 7 - Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Apr. 28, 2018	Apr. 29, 2017
Deferred tax assets:
Accrued expenses and other	$ 2,900	$ 4,740
Inventory and amortizable assets	331	538
Total deferred tax assets	3,231	5,278
Deferred tax liabilities:
Property	14,858	15,157
Intangibles and other	2,875	2,208
Total deferred tax liabilities	17,733	17,365
Net deferred tax liabilities	$ 14,502	$ 12,087