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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, 2022
Mar. 31, 2021
Mar. 31, 2022
Mar. 31, 2021
UNITED STATES        
Service cost $ 1 $ 1 $ 3 $ 3
Interest cost 1,830 1,860 5,490 5,579
Expected return on plan assets (3,260) (3,253) (9,779) (9,759)
Recognized net actuarial loss 1,384 1,483 4,151 4,450
Amortization of prior service cost 0 0 0 0
Net periodic benefit cost (45) 91 (135) 273
Foreign Plan [Member]        
Service cost 58 55 179 164
Interest cost 193 185 576 539
Expected return on plan assets (215) (161) (641) (468)
Recognized net actuarial loss 84 193 253 562
Amortization of prior service cost (1) (1) (3) (4)
Net periodic benefit cost $ 119 $ 271 $ 364 $ 793