Stock-Based Compensation, Phantom Stock Option Plan and Long-term Incentive Plan (Details) - 2011 Phantom Stock Option and Long-term Incentive Plan [Member] - USD ($) $ in Thousands	3 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Jun. 30, 2017
Stock option related information [Abstract]
Total liability for long-term incentive plan	$ 2,400		$ 2,000
Phantom Stock Option [Member]
Stock option activity, shares [Roll Forward]
Outstanding at beginning of year (in shares)	1,522,720	1,352,554
Options granted (in shares)	594,200	578,200
Options paid in cash (in shares)	(3,000)	0
Outstanding at period end (in shares)	2,113,920	1,930,754
Stock option related information [Abstract]
Cash paid out on options vested	$ 7	$ 0
Compensation expense recognized	$ 360	$ 241