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Note 11 - Retirement Benefits - Contributions to Defined Benefit Plans (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Mar. 31, 2023	Mar. 31, 2022
Contributions to defined benefit plans	$ 49	$ 52	$ 151	$ 157
Remaining contributions to be made		288		288
UNITED STATES | Defined Benefit Plan, Funded Plan [Member]
Contributions to defined benefit plans	0	0	0	0
Remaining contributions to be made		0		0
UNITED STATES | Defined Benefit Plan, Unfunded Plan [Member]
Contributions to defined benefit plans	49	52	151	157
Remaining contributions to be made		49		49
UNITED KINGDOM
Contributions to defined benefit plans	0	0	0	0
Remaining contributions to be made		0		0
GERMANY | Defined Benefit Plan, Unfunded Plan [Member]
Contributions to defined benefit plans	$ 0	0	$ 0	0
Remaining contributions to be made		$ 239		$ 239

X

- Definition

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

+ References

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- Definition

Amount of contribution expected to be received by defined benefit plan from employer in remainder of current fiscal year. Excludes contribution previously paid by employer in current fiscal year.

+ References

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