Stock-Based Compensation, Phantom Stock Option Plan and Long-term Incentive Plan (Details) - USD ($)	12 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Mar. 15, 2016	Dec. 31, 2015	Jun. 30, 2014
Stock option activity, shares [Roll Forward]
Options granted (in shares)	0	0
2011 Phantom Stock Option and Long-term Incentive Plan [Member]
Share-based compensation arrangement by share-based payment award [Line Items]
Number of shares authorized under the plan (in shares)			3,600,000	1,800,000	900,000
Stock option activity, shares [Roll Forward]
Outstanding at beginning of year (in shares)	1,257,508	1,330,852
Options granted (in shares)	493,760	470,760
Options forfeited (in shares)	(1,000)	0
Options paid in cash upon vesting (in shares)	(396,714)	(544,104)
Outstanding at year end (in shares)	1,353,554	1,257,508
Cash paid on options vested	$ 710,500	$ 845,000
Allocated share-based compensation expense	1,000,000	830,000
Total liability for long-term incentive plan	$ 1,400,000	$ 1,100,000
2011 Phantom Stock Option and Long-term Incentive Plan [Member] | Minimum [Member]
Share-based compensation arrangement by share-based payment award [Line Items]
Strike price of phantom stock options as percent of book value	100.00%