Note 8 - Accrued Expenses (Details Textual) - USD ($) $ in Millions	Dec. 30, 2018	Dec. 31, 2017
Liability, Defined Benefit Pension Plan, Noncurrent	$ 62.4	$ 43.3

Amount of liability, recognized in statement of financial position, for defined benefit pension plan, classified as noncurrent. Excludes other postretirement benefit plan.

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant