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Note 13 - Retirement Benefit Plans - Accumulated Benefit Obligations (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
UNITED STATES | Nonqualified Plan [Member]
Accumulated benefit obligation	$ 1.2	$ 1.3
Foreign Plan [Member] | Pension Plan [Member] | UK Pension Plan [Member]
Accumulated benefit obligation	12.2	10.4
Foreign Plan [Member] | Pension Plan [Member] | German Pension Plan [Member]
Accumulated benefit obligation	1.2	1.0
Foreign Plan [Member] | Pension Plan [Member] | Italian Pension Plan [Member]
Accumulated benefit obligation	$ 4.2	$ 4.3

X

- Definition

Amount of actuarial present value of benefits attributed to employee service rendered, excluding assumptions about future compensation level.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (e)
-URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920

+ Details

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

X

- Details

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X

- Details

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X

- Details

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- Details

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- Details

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- Details

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- Details

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