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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, 2025
Mar. 31, 2024
Mar. 31, 2025
Mar. 31, 2024
UNITED STATES        
Service cost $ 0 $ 0 $ 0 $ 0
Interest cost 2,386 2,472 7,158 7,418
Expected return on plan assets (2,641) (2,776) (7,923) (8,334)
Recognized net actuarial loss 1,055 950 3,166 2,852
Amortization of prior service cost 0 0 0 0
Net periodic (benefit) cost 800 646 2,401 1,936
Foreign Plan [Member]        
Service cost 61 41 185 122
Interest cost 295 296 903 885
Expected return on plan assets (335) (350) (1,026) (1,049)
Recognized net actuarial loss 0 (152) 0 (454)
Amortization of prior service cost (1) (1) (2) (3)
Net periodic (benefit) cost $ 20 $ (166) $ 60 $ (499)