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Note 12 - Retirement Benefits - Components of Net Periodic Benefit Cost (Details) - USD ($)
$ in Thousands
 3 Months Ended
Sep. 30, 2020
Sep. 30, 2019
UNITED STATES    
Service cost $ 1 $ 1
Interest cost 1,860 2,271
Expected return on plan assets (3,253) (3,288)
Recognized net actuarial loss 1,483 1,275
Amortization of prior service cost 0 0
Net periodic benefit cost 91 259
Foreign Plan [Member]    
Service cost 54 10
Interest cost 176 205
Expected return on plan assets (153) (211)
Recognized net actuarial loss 184 158
Amortization of prior service cost (1) 0
Net periodic benefit cost $ 260 $ 162