Variable Interest Entity (Details) (USD $)	12 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2014 Variable Interest Entity, Primary Beneficiary	Jun. 30, 2013 Variable Interest Entity, Primary Beneficiary	Dec. 31, 2013 Subordinated Debt Variable Interest Entity, Primary Beneficiary	Jun. 30, 2014 Subordinated Debt CAH note payable Variable Interest Entity, Primary Beneficiary	Oct. 01, 2013 Subordinated Debt CAH note payable Variable Interest Entity, Primary Beneficiary	Jun. 30, 2013 Subordinated Debt CAH note payable Variable Interest Entity, Primary Beneficiary
Current assets:
Cash and cash equivalents	$ 27,597,000	$ 18,136,000	$ 16,561,000	$ 10,829,000	$ 0	$ 40,000
Restricted investments	2,934,000	5,582,000			63,000	63,000
Total current assets	221,041,000	185,350,000			63,000	103,000
Other assets	13,378,000	13,992,000			4,344,000	4,344,000
Total assets	335,585,000	307,764,000			4,407,000	4,447,000
Current liabilities:
Current portion of long-term debt	463,000	4,745,000			0	2,448,000
Environmental remediation liabilities	138,000	291,000			7,000	0
Other accrued liabilities	11,698,000	6,375,000			0	13,000
Total current liabilities	132,225,000	123,713,000			7,000	2,461,000
Long-term environmental remediation liabilities	6,268,000	6,973,000			16,000	1,000
Total liabilities	210,702,000	200,867,000			23,000	2,462,000
Variable Interest Entity, Financial or Other Support, Amount	3,977,000
Subordinated Long-term Debt, Noncurrent							$ 1,500,000	$ 0	$ 2,448,000	$ 2,448,000