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Note 10 - Retirement Benefits (Details Textual) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Apr. 30, 2018 | Mar. 31, 2018 | Mar. 31, 2017 | Mar. 31, 2018 | Mar. 31, 2017
UNITED STATES |  |  |  |  |
Defined Benefit Plan, Expected Future Employer Contributions, Remainder of Fiscal Year |  | $ 0.2 |  | $ 0.2 |
UNITED STATES | Subsequent Event [Member] |  |  |  |  |
Defined Benefit Plan, Plan Assets, Contributions by Employer | $ 5.5 |  |  |  |
UNITED KINGDOM | Foreign Plan [Member] |  |  |  |  |
Defined Benefit Plan, Expected Future Employer Contributions, Remainder of Fiscal Year |  | 0.9 |  | 0.9 |
GERMANY | Foreign Plan [Member] |  |  |  |  |
Defined Benefit Plan, Expected Future Employer Contributions, Remainder of Fiscal Year |  | 0.3 |  | 0.3 |
Pension Plan [Member] |  |  |  |  |
Defined Benefit Plan, Expected Future Employer Contributions, Remainder of Fiscal Year |  | 6.9 |  | 6.9 |
Defined Benefit Plan, Plan Assets, Contributions by Employer |  | $ 0.3 | $ 0.3 | $ 0.8 | $ 1.0

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