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Note 16 - Employee Benefit Plans - Components of Net Periodic Benefit Cost (Details) - USD ($)
$ in Thousands
 12 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2018
UNITED STATES      
Service Cost $ 3 $ 3 $ 3
Interest Cost 9,083 10,342 10,079
Expected return on plan assets (13,150) (13,541) (13,484)
Recognized net actuarial loss 5,101 4,121 4,579
Amortization of prior service cost (benefit) 0 0 0
Net periodic benefit cost (benefit) 1,037 925 1,177
Foreign Plan [Member]      
Service Cost 236 189 187
Interest Cost 846 1,013 1,050
Expected return on plan assets (868) (908) (947)
Recognized net actuarial loss 651 340 941
Amortization of prior service cost (benefit) (5) (3) (37)
Net periodic benefit cost (benefit) $ 860 $ 631 $ 1,194