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Note 10 - Retirement Benefits - Components of Net Periodic Benefit Cost (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Domestic Plan [Member]        
Service cost $ 1 $ 1 $ 2 $ 2
Interest cost 2,520 2,613 5,040 5,226
Expected return on plan assets (3,354) (3,440) (6,707) (6,881)
Recognized net actuarial loss 1,145 1,190 2,290 2,381
Amortization of prior service cost
Net periodic benefit cost 312 364 625 728
Foreign Plan [Member]        
Service cost 9 9 18 19
Interest cost 259 250 514 514
Expected return on plan assets (235) (282) (466) (579)
Recognized net actuarial loss 234 249 463 511
Amortization of prior service cost (9) (12) (17) (24)
Net periodic benefit cost $ 258 $ 214 $ 512 $ 441