Note 13 - Defined Contribution Pension Plan and Post-employment Benefit Plan (Details Textual) - USD ($) $ in Thousands	12 Months Ended
Dec. 29, 2019	Dec. 30, 2018	Dec. 31, 2017
Defined Benefit Plan, Plan Assets, Contributions by Employer	$ 469	$ 139	$ 125
MEXICO
Postemployment Benefits Liability, Total	$ 458	$ 275

Amount of contribution received by defined benefit plan from employer which increases plan assets.

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Name:	us-gaap_DefinedBenefitPlanContributionsByEmployer
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration