Note 11 - Retirement Benefits - Contributions to Defined Benefit Plans (Details) $ in Thousands	3 Months Ended
Sep. 30, 2023 USD ($)
Contributions to defined benefit plans	$ 49
Remaining contributions to be made	10,165
UNITED STATES \| Defined Benefit Plan, Funded Plan [Member]
Contributions to defined benefit plans	0
Remaining contributions to be made	9,805
UNITED STATES \| Defined Benefit Plan, Unfunded Plan [Member]
Contributions to defined benefit plans	49
Remaining contributions to be made	103
UNITED KINGDOM
Contributions to defined benefit plans	0
Remaining contributions to be made	0
GERMANY \| Defined Benefit Plan, Unfunded Plan [Member]
Contributions to defined benefit plans	0
Remaining contributions to be made	$ 257

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

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 715
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-Name Accounting Standards Codification
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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Reference 3: http://www.xbrl.org/2003/role/exampleRef
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Reference 7: http://www.xbrl.org/2003/role/exampleRef
-Topic 715
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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration