Pensions and Other Postretirement Benefits - Obligations and funded status (Details) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Change in benefit obligation:
Benefit obligation at beginning of year	$ 4,581	$ 4,610
Interest cost	60	73
Actuarial loss	432	51
Foreign currency exchange rate change	(123)	108
Benefits paid	(248)	(261)
Benefit obligation at end of year	4,702	4,581
Change in plan assets:
Fair value of plan assets at beginning of year	809	1,021
Actual return on plan assets	1	(1)
Employer contributions	13	14
Benefits paid	(242)	(254)
Foreign currency exchange rate change	(21)	29
Fair value of plan assets at end of year	560	809
Funded status at end of year	$ (4,142)	$ (3,772)