Note 12 - Retirement Benefits - Components of Net Periodic Benefit Cost (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2019	Dec. 31, 2018
UNITED STATES
Service cost	$ 1	$ 1	$ 2	$ 2
Interest cost	2,271	2,586	4,542	5,171
Expected return on plan assets	(3,288)	(3,385)	(6,575)	(6,771)
Recognized net actuarial loss	1,275	1,030	2,551	2,061
Net periodic benefit cost	259	232	520	463
Foreign Plan [Member]
Service cost	10	9	20	17
Interest cost	213	249	418	503
Expected return on plan assets	(221)	(225)	(432)	(453)
Recognized net actuarial loss	165	84	323	170
Net periodic benefit cost	$ 167	$ 117	$ 329	$ 237