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Note 11 - Retirement Benefits (Details Textual) - USD ($)
$ in Millions
3 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Pension Plan [Member]    
Defined Benefit Plans, Estimated Future Employer Contributions in Current Fiscal Year $ 1.4  
Defined Benefit Plan, Contributions by Employer 0.2 $ 0.3
Foreign Pension Plan [Member] | UNITED KINGDOM    
Defined Benefit Plans, Estimated Future Employer Contributions in Current Fiscal Year 0.8  
Foreign Pension Plan [Member] | GERMANY    
Defined Benefit Plans, Estimated Future Employer Contributions in Current Fiscal Year 0.3  
United States Pension Plan of US Entity [Member] | UNITED STATES    
Defined Benefit Plans, Estimated Future Employer Contributions in Current Fiscal Year $ 0.3