Note 9 - Pension and Post-retirement Benefits (Details Textual) $ in Millions	3 Months Ended	9 Months Ended
	Mar. 31, 2020 USD ($)	Mar. 31, 2020 USD ($)
Defined Benefit Plan, Expected Future Employer Contributions, Remainder of Fiscal Year	$ 1.6	$ 1.6
Pension Plan [Member] | UNITED STATES
Defined Benefit Plan, Plan Assets, Contributions by Employer	3.1	5.4
Pension Plan [Member] | Foreign Plan [Member]
Defined Benefit Plan, Plan Assets, Contributions by Employer	$ 0.2	$ 0.7