Note 12 - Pension Plans (Details Textual) $ in Thousands	6 Months Ended	9 Months Ended
	Dec. 31, 2018 USD ($)	Dec. 31, 2018 USD ($)
Foreign Plan [Member]
Defined Benefit Plan, Plan Assets, Contributions by Employer		$ 5,061
Defined Benefit Plan, Expected Future Employer Contributions, Remainder of Fiscal Year	$ 1,600	1,600
UNITED STATES
Defined Benefit Plan, Plan Assets, Contributions by Employer	2,289
Defined Benefit Plan, Expected Future Employer Contributions, Remainder of Fiscal Year	$ 0	$ 0