Benefit Plans (Details) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2017
Change in plan assets:
Fair value of plan assets at beginning of year	$ 7,702
Fair value of plan assets at end of year	8,474	$ 7,702
Pension Benefits [Member]
Change in benefit obligation:
Benefit obligation at beginning of the year	21,534	24,411
Service cost	45	124	$ 126
Interest cost	698	729	687
Plan participants’ contributions	0	0
Benefits paid	3,695	3,181
Actuarial loss (gain) during year	486	(549)
Benefit obligation at end of year	19,068	21,534	24,411
Change in plan assets:
Fair value of plan assets at beginning of year	7,702	6,530
Actual gain on plan assets	669	516
Employer contributions	3,798	3,837
Plan participants’ contributions	0	0
Benefits paid	3,695	3,181
Fair value of plan assets at end of year	8,474	7,702	6,530
Funded status at end of year	(10,594)	(13,832)
Postretirement Health Coverage [Member]
Change in benefit obligation:
Benefit obligation at beginning of the year	1,491	1,684
Service cost	18	19	29
Interest cost	54	52	63
Plan participants’ contributions	69	68
Benefits paid	150	223
Actuarial loss (gain) during year	24	(109)
Benefit obligation at end of year	1,506	1,491	1,684
Change in plan assets:
Fair value of plan assets at beginning of year	0	0
Actual gain on plan assets	0	0
Employer contributions	81	155
Plan participants’ contributions	69	68
Benefits paid	150	223
Fair value of plan assets at end of year	0	0	0
Funded status at end of year	(1,506)	(1,491)
Selling, General and Administrative Expenses [Member]
Change in benefit obligation:
Service cost	$ 63	$ 143	$ 155