Note 11 - Retirement Benefits - Contributions to Defined Benefit Plans (Details) $ in Thousands	6 Months Ended
Dec. 31, 2023 USD ($)
Contributions to defined benefit plans	$ 1,541
Remaining contributions to be made	8,671
UNITED STATES \| Defined Benefit Plan, Funded Plan [Member]
Contributions to defined benefit plans	1,442
Remaining contributions to be made	8,363
UNITED STATES \| Defined Benefit Plan, Unfunded Plan [Member]
Contributions to defined benefit plans	99
Remaining contributions to be made	53
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	$ 255

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
-SubTopic 20
-Name Accounting Standards Codification
-Section 55
-Paragraph 17
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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
-Topic 715
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Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
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Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
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Reference 6: http://www.xbrl.org/2003/role/exampleRef
-Topic 715
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Reference 7: http://www.xbrl.org/2003/role/exampleRef
-Topic 715
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-Section 50
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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration