Note 8 - Pension - Estimated Contributions to Pension Plans (Details) - Pension Plan [Member] - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018
Estimated contributions in 2020	$ 2,649
Contributions made in 2019	3,322	$ 3,197
UNITED STATES
Estimated contributions in 2020	163
Contributions made in 2019	112
Foreign Plan [Member]
Estimated contributions in 2020	2,486
Contributions made in 2019	$ 3,210	$ 3,197

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