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Note 11 - Retirement Benefits - Components of Net Periodic Benefit Cost (Details) - USD ($)
$ in Thousands
 3 Months Ended
Sep. 30, 2021
Sep. 30, 2020
UNITED STATES    
Service cost $ 1 $ 1
Interest cost 1,830 1,860
Expected return on plan assets (3,260) (3,253)
Recognized net actuarial loss 1,384 1,483
Amortization of prior service cost 0 0
Net periodic benefit cost (45) 91
Foreign Plan [Member]    
Service cost 63 54
Interest cost 190 176
Expected return on plan assets (211) (153)
Recognized net actuarial loss 84 184
Amortization of prior service cost (1) (1)
Net periodic benefit cost $ 125 $ 260