Note 8 - Pension and Post-retirement Benefits (Details Textual) $ in Millions	9 Months Ended
	Mar. 31, 2019 USD ($)
Defined Benefit Plan, Expected Future Employer Contributions, Remainder of Fiscal Year	$ 1.3
Pension Plan [Member] | UNITED STATES
Defined Benefit Plan, Plan Assets, Contributions by Employer	3.5
Pension Plan [Member] | Foreign Plan [Member]
Defined Benefit Plan, Plan Assets, Contributions by Employer	$ 0.7