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Note 12 - Retirement Benefits - Components of Net Periodic Benefit Cost (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
UNITED STATES        
Service cost $ 1 $ 1 $ 2 $ 2
Interest cost 2,586 2,520 5,171 5,040
Expected return on plan assets (3,385) (3,354) (6,771) (6,707)
Recognized net actuarial loss 1,030 1,145 2,061 2,290
Amortization of prior service cost
Net periodic benefit cost 232 312 463 625
Foreign Plan [Member]        
Service cost 9 9 17 18
Interest cost 249 259 503 514
Expected return on plan assets (225) (235) (453) (466)
Recognized net actuarial loss 84 234 170 463
Amortization of prior service cost (9) (17)
Net periodic benefit cost $ 117 $ 258 $ 237 $ 512