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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, 2023
Mar. 31, 2022
Mar. 31, 2023
Mar. 31, 2022
UNITED STATES        
Service cost $ 0 $ 1 $ 0 $ 3
Interest cost 2,397 1,830 7,190 5,490
Expected return on plan assets (2,993) (3,260) (8,980) (9,779)
Recognized net actuarial loss 953 1,384 2,860 4,151
Amortization of prior service cost 0 0 0 0
Net periodic benefit cost 357 (45) 1,070 (135)
Foreign Plan [Member]        
Service cost 44 58 131 179
Interest cost 249 193 774 576
Expected return on plan assets (218) (215) (710) (641)
Recognized net actuarial loss (13) 84 (44) 253
Amortization of prior service cost (1) (1) (3) (3)
Net periodic benefit cost $ 61 $ 119 $ 148 $ 364