Note 11 - Retirement Benefits - Contributions to Defined Benefit Plans (Details) - USD ($) $ in Thousands	3 Months Ended
Sep. 30, 2022	Sep. 30, 2021
Contributions to defined benefit plans	$ 52	$ 52
Remaining contributions to be made	440
UNITED STATES \| Defined Benefit Plan, Funded Plan [Member]
Contributions to defined benefit plans	0	0
Remaining contributions to be made	0
UNITED STATES \| Defined Benefit Plan, Unfunded Plan [Member]
Contributions to defined benefit plans	52	52
Remaining contributions to be made	148
UNITED KINGDOM
Contributions to defined benefit plans	0	0
Remaining contributions to be made	0
GERMANY \| Defined Benefit Plan, Unfunded Plan [Member]
Contributions to defined benefit plans	0	0
Remaining contributions to be made	234
IRELAND
Contributions to defined benefit plans	0	$ 0
Remaining contributions to be made	$ 58

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

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