Note 1 - Accounting Policies (Details Textual) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Dec. 29, 2019	Dec. 29, 2019	Jul. 01, 2019	Jun. 30, 2019
Contract with Customer, Liability, Current	$ 28,800	$ 28,800		$ 17,300
Contract with Customer, Liability, Revenue Recognized	5,900	15,900
Operating Lease, Liability, Total	75,254	75,254
Operating Lease, Right-of-Use Asset	$ 72,943	$ 72,943
Accounting Standards Update 2016-02 [Member]
Operating Lease, Liability, Total			$ 80,700
Operating Lease, Right-of-Use Asset			$ 78,700