Note 12 - Retirement Benefits - Components of Net Periodic Benefit Cost (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2020	Dec. 31, 2019
UNITED STATES
Service cost	$ 1	$ 1	$ 2	$ 2
Interest cost	1,860	2,271	3,720	4,542
Expected return on plan assets	(3,253)	(3,288)	(6,506)	(6,575)
Recognized net actuarial loss	1,483	1,275	2,967	2,551
Amortization of prior service cost	0	0	0	0
Net periodic benefit cost	91	259	183	520
Foreign Plan [Member]
Service cost	55	10	110	20
Interest cost	178	213	354	418
Expected return on plan assets	(155)	(221)	(307)	(432)
Recognized net actuarial loss	186	165	369	323
Amortization of prior service cost	(1)	0	(2)	0
Net periodic benefit cost	$ 263	$ 167	$ 524	$ 329