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Dehli Field Litigation Settlement (Details) - USD ($)		12 Months Ended
	Jun. 24, 2016	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2016
Loss Contingencies [Line Items]
Delhi field litigation settlement gain		$ 0	$ 0	$ 28,096,500
Fair value of litigation settlement		$ 0	$ 0	$ 596,500
Dehli Field Litigation | Denbury Resources, Inc
Loss Contingencies [Line Items]
Delhi field litigation settlement gain	$ 28,100,000
Proceeds from litigation	$ 27,500,000
Working interest in Mengal Sand Interval	23.90%
Fair value of litigation settlement	$ 596,500
Overriding royalty interest in Holt-Bryant	0.2226%
Dehli Field Litigation | Denbury Resources, Inc | Level 2
Loss Contingencies [Line Items]
Fair value of litigation settlement	$ 596,500

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Amount of gain (loss) recognized in settlement of litigation and insurance claims. Excludes claims within an insurance entity's normal claims settlement process.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 1
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Cash received for the settlement of litigation during the current period.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 25
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