Fair Value Measurements (Details) - USD ($)	3 Months Ended	9 Months Ended
	Mar. 31, 2016	Mar. 31, 2016	Mar. 31, 2015	Jun. 30, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available-for-sale	$ 601,000	$ 601,000		$ 4,230,000
Rolling gross production average		60 days
Exploration costs previously capitalized		$ 0	$ 20,000
Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available-for-sale	601,000	601,000		4,230,000
Contingent consideration payable	0	0		0
Recurring | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available-for-sale	601,000	601,000		4,230,000
Recurring | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Contingent consideration payable	0	$ 0		$ 0
One Stone Exchange Agreement
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impairment of proved oil and gas properties	7,800,000
Accounts Receivable, Impairment Charges	100,000
Exploration costs previously capitalized	3,400,000
Asset Impairment Charges	$ 11,300,000