Note 13 - Retirement Benefits - Contributions to Defined Benefit Plans (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2021	Mar. 31, 2020
Contributions to defined benefit plans	$ 3,083	$ 1,522	$ 7,962	$ 3,483
Remaining contributions to be made	406		406
UNITED STATES | Defined Benefit Plan, Funded Plan [Member]
Contributions to defined benefit plans	3,030	1,468	7,805	2,936
Remaining contributions to be made	0		0
UNITED STATES | Defined Benefit Plan, Unfunded Plan [Member]
Contributions to defined benefit plans	53	54	157	166
Remaining contributions to be made	54		54
UNITED KINGDOM
Contributions to defined benefit plans	0	0	0	381
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	285		285
IRELAND
Contributions to defined benefit plans	0	$ 0	0	$ 0
Remaining contributions to be made	$ 67		$ 67