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Note 11 - Retirement Benefits - Components of Net Periodic Benefit Cost (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2023
Dec. 31, 2022
UNITED STATES        
Service cost $ 0 $ 0 $ 0 $ 0
Interest cost 2,473 2,396 4,946 4,793
Expected return on plan assets (2,779) (2,994) (5,558) (5,987)
Recognized net actuarial loss 951 954 1,902 1,907
Amortization of prior service cost 0 0 0 0
Net periodic (benefit) cost 645 356 1,290 713
Foreign Plan [Member]        
Service cost 40 43 81 87
Interest cost 292 263 589 525
Expected return on plan assets (346) (247) (699) (492)
Recognized net actuarial loss (150) (16) (302) (31)
Amortization of prior service cost (1) (1) (2) (2)
Net periodic (benefit) cost $ (165) $ 42 $ (333) $ 87