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Note 11 - Retirement Benefits (Details Textual) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Defined Benefit Plans, Estimated Future Employer Contributions in Current Fiscal Year     $ 1.3  
Pension Plan [Member]        
Defined Benefit Plan, Contributions by Employer $ 0.4 $ 0.3 0.6 $ 0.6
Foreign Pension Plan [Member] | UNITED KINGDOM        
Defined Benefit Plans, Estimated Future Employer Contributions in Current Fiscal Year     0.7  
United States Pension Plan of US Entity [Member] | UNITED STATES        
Defined Benefit Plans, Estimated Future Employer Contributions in Current Fiscal Year     $ 0.3