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Supplemental Disclosure of Cash Flow Information - Schedule of Supplement Cash Flow (Details) - USD ($)
 12 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2016
Supplemental Cash Flow Elements [Abstract]      
Income taxes paid $ 1,826,754 $ 1,495,377 $ 540,000
Income tax refunds 0 0 1,556,999
Non-cash transactions:      
Increase (decrease) in accrued purchases of property and equipment 1,695,218 (3,076,245) (2,250,048)
Deferred loan costs charged to oil and gas property costs 0 0 107,196
Oil and natural gas property costs attributable to the recognition of asset retirement obligations 43,922 471,864 140,151
Mengel working interest acquired in Delhi Field litigation settlement 0 0 596,500
Royalty rights acquired through non-monetary exchange of patent and trademark assets 0 0 108,512
Previously acquired Company shares swapped by holders to pay stock option exercise price 0 77,156 76,500
Accrued purchases of treasury stock $ 0 $ 0 $ (170,283)