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Note 11 - Retirement Benefits - Contributions to Defined Benefit Plans (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Mar. 31, 2022
Mar. 31, 2021
Contributions to defined benefit plans $ 52 $ 3,083 $ 157 $ 7,962
Remaining contributions to be made 399   399  
UNITED STATES | Defined Benefit Plan, Funded Plan [Member]        
Contributions to defined benefit plans 0 3,030 0 7,805
Remaining contributions to be made 0   0  
UNITED STATES | Defined Benefit Plan, Unfunded Plan [Member]        
Contributions to defined benefit plans 52 53 157 157
Remaining contributions to be made 54   54  
UNITED KINGDOM        
Contributions to defined benefit plans 0 0 0 0
Remaining contributions to be made 0   0  
GERMANY | Defined Benefit Plan, Unfunded Plan [Member]        
Contributions to defined benefit plans 0 0 0 0
Remaining contributions to be made 280   280  
IRELAND        
Contributions to defined benefit plans 0 $ 0 0 $ 0
Remaining contributions to be made $ 65   $ 65