Note 7 - Pension and Post-retirement Benefits (Details Textual) - USD ($) $ in Millions	9 Months Ended
	Mar. 31, 2018	Dec. 31, 2016
Defined Benefit Plan, Benefit Obligation, Increase (Decrease) for Plan Amendment	$ (6.9)
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate	4.31%	3.77%
Defined Benefit Plan, Benefit Obligation, (Increase) Decrease for Curtailment	$ 4.2
Defined Benefit Plan, Expected Future Employer Contributions, Remainder of Fiscal Year	1.2
Pension Plan [Member]
Defined Benefit Plan, Plan Assets, Contributions by Employer	2.8
Pension Plan [Member] | Foreign Plan [Member]
Defined Benefit Plan, Plan Assets, Contributions by Employer	$ 0.8