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Note 11 - Retirement Benefits - Components of Net Periodic Benefit Cost (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Mar. 31, 2024
Mar. 31, 2023
UNITED STATES        
Service cost $ 0 $ 0 $ 0 $ 0
Interest cost 2,472 2,397 7,418 7,190
Expected return on plan assets (2,776) (2,993) (8,334) (8,980)
Recognized net actuarial loss 950 953 2,852 2,860
Amortization of prior service cost 0 0 0 0
Net periodic (benefit) cost 646 357 1,936 1,070
Foreign Plan [Member]        
Service cost 41 44 122 131
Interest cost 296 249 885 774
Expected return on plan assets (350) (218) (1,049) (710)
Recognized net actuarial loss (152) (13) (454) (44)
Amortization of prior service cost (1) (1) (3) (3)
Net periodic (benefit) cost $ (166) $ 61 $ (499) $ 148