Note 12 - Retirement Benefits - Components of Net Periodic Benefit Cost (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2019	Mar. 31, 2018
UNITED STATES
Service cost	$ 1	$ 1	$ 3	$ 3
Interest cost	2,586	2,520	7,757	7,560
Expected return on plan assets	(3,385)	(3,354)	(10,156)	(10,061)
Recognized net actuarial loss	1,030	1,145	3,091	3,435
Amortization of prior service cost
Net periodic benefit cost	232	312	695	937
Foreign Plan [Member]
Service cost	9	9	26	27
Interest cost	254	269	757	783
Expected return on plan assets	(229)	(244)	(682)	(710)
Recognized net actuarial loss	86	242	256	705
Amortization of prior service cost		(9)		(26)
Net periodic benefit cost	$ 120	$ 267	$ 357	$ 779