Stock-Based Compensation, Phantom Stock Option Plan and Long-term Incentive Plan (Details) - USD ($)	3 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Jun. 30, 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)	1,800,000			900,000
Stock option activity, shares [Roll Forward]
Outstanding at beginning of year (in shares)	628,754	665,426
Options granted (in shares)	246,880	241,090
Options paid in cash upon vesting (in shares)	(198,357)	(227,484)
Outstanding at period end (in shares)	677,277	679,032
Cash paid on options vested	$ 710,500	$ 757,700
Allocated share-based compensation expense	180,000	$ 170,000
Total liability for the long-term incentive plan	$ 610,000		$ 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%