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Note 13 - Retirement Benefits - Components of Net Periodic Benefit Cost (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Mar. 31, 2021
Mar. 31, 2020
UNITED STATES        
Service cost $ 1 $ 1 $ 3 $ 3
Interest cost 1,860 2,271 5,579 6,813
Expected return on plan assets (3,253) (3,288) (9,759) (9,863)
Recognized net actuarial loss 1,483 1,275 4,450 3,826
Amortization of prior service cost 0 0 0 0
Net periodic benefit cost 91 259 273 779
Foreign Plan [Member]        
Service cost 55 10 164 29
Interest cost 185 214 539 632
Expected return on plan assets (161) (222) (468) (654)
Recognized net actuarial loss 193 165 562 488
Amortization of prior service cost (1) 0 (4) 0
Net periodic benefit cost $ 271 $ 167 $ 793 $ 495