Note 6 - Leases (Details Textual) - USD ($)	3 Months Ended
	Jul. 27, 2019	Apr. 28, 2019	Apr. 27, 2019
Operating Lease, Liability, Total	$ 52,429,000
Operating Lease, Weighted Average Remaining Lease Term	4 years 2 months 12 days
Operating Lease, Weighted Average Discount Rate, Percent	3.38%
Operating Lease, Expense	$ 3,400,000
Short-term Lease, Cost	3,000,000
Operating Lease, Payments	3,700,000
Operating Lease, Right-of-Use Asset	$ 52,460,000		$ 0
Accounting Standards Update 2016-02 [Member]
Operating Lease, Liability, Total		$ 55,500,000