Stock-Based Compensation, Phantom Stock Option Plan and Long-term Incentive Plan (Details) (USD $)	3 Months Ended		9 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2015	Mar. 31, 2014	Jun. 30, 2014
Number of 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		1,800,000		900,000
Strike price of phantom stock options as percent of book value (in hundredths)	100.00%		100.00%
Number of Shares [Roll Forward]
Outstanding at beginning of year (in shares)			665,426	462,464
Options granted (in shares)			235,380	227,330
Options paid in cash upon vesting (in shares)			(258,372)	(17,528)
Outstanding at period end (in shares)	642,434	672,266	642,434	672,266
Cash paid on options vested	$ 50,900	$ 0	$ 808,600	$ 26,900
Allocated share-based compensation expense	190,000	207,000	570,000	546,800
Total liability for the long-term incentive plan	$ 916,900		$ 916,900		$ 1,200,000