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Note 12 - Retirement Benefits - Components of Net Periodic Benefit Cost (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Mar. 31, 2020
Mar. 31, 2019
UNITED STATES        
Service cost $ 1 $ 1 $ 3 $ 3
Interest cost 2,271 2,586 6,813 7,757
Expected return on plan assets (3,288) (3,385) (9,863) (10,156)
Recognized net actuarial loss 1,275 1,030 3,826 3,091
Net periodic benefit cost 259 232 779 695
Foreign Plan [Member]        
Service cost 10 9 29 26
Interest cost 214 254 632 757
Expected return on plan assets (222) (229) (654) (682)
Recognized net actuarial loss 165 86 488 256
Net periodic benefit cost $ 167 $ 120 $ 495 $ 357