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Supplemental Disclosure of Cash Flow Information
 12 Months Ended
Jun. 30, 2017
Supplemental Cash Flow Elements [Abstract]  
Supplemental Disclosure of Cash Flow Information
Supplemental Disclosure of Cash Flow Information
Our supplemental disclosures of cash flow information for the years ended June 30, 2017, 2016, and 2015 are as follows:
 
June 30,
 
2017
 
2016
 
2015
Income taxes paid
$
1,495,377

 
$
540,000

 
$
220,000

Income tax refunds
—

 
1,556,999

 
331,733

Non-cash transactions:
 
 
 
 
 
Increase (decrease) in accrued purchases of property and equipment
(3,076,245
)
 
(2,250,048
)
 
5,422,566

Deferred loan costs charged to oil and gas property costs
—

 
107,196

 
—

Oil and natural gas property costs attributable to the recognition of asset retirement obligations
471,864

 
140,151

 
576,039

Mengel working interest acquired in Delhi Field litigation settlement
—

 
596,500

 
—

Royalty rights acquired through non-monetary exchange of patent and trademark assets
—

 
108,512

 
—

Previously acquired Company shares swapped by holders to pay stock option exercise price
$
77,156

 
$
76,500

 
$
—

Accrued purchases of treasury stock
—

 
(170,283
)
 
170,283