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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, 2021
Dec. 31, 2020
Dec. 31, 2021
Dec. 31, 2020
UNITED STATES        
Service cost $ 1 $ 1 $ 2 $ 2
Interest cost 1,830 1,860 3,660 3,720
Expected return on plan assets (3,259) (3,253) (6,519) (6,506)
Recognized net actuarial loss 1,383 1,483 2,767 2,967
Amortization of prior service cost 0 0 0 0
Net periodic benefit cost (45) 91 (90) 183
Foreign Plan [Member]        
Service cost 59 55 122 110
Interest cost 195 178 385 354
Expected return on plan assets (217) (155) (428) (307)
Recognized net actuarial loss 86 186 170 369
Amortization of prior service cost (1) (1) (2) (2)
Net periodic benefit cost $ 122 $ 263 $ 247 $ 524