Note 7 - Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Apr. 29, 2017	Apr. 30, 2016
Deferred tax assets:
Accrued expenses and other	$ 4,740	$ 5,655
Inventory and amortizable assets	538	538
Total deferred tax assets	5,278	6,193
Deferred tax liabilities:
Property	15,157	14,049
Intangibles and other	2,208	2,164
Total deferred tax liabilities	17,365	16,213
Net deferred tax liabilities	12,087	10,020
Current deferred tax assets – net	3,906	4,454
Noncurrent deferred tax liabilities – net	$ 15,993	$ 14,474