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Income Taxes - Reconciliation of Statutory and Income Tax Expense (Details) - USD ($) | 12 Months Ended
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Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2015
Effective Income Tax Rate Reconciliation, Amount [Abstract] |  |  |
Income tax provision computed at the statutory federal rate | $ 4,380,892 | $ 11,638,588 | $ 2,868,267
Depletion in excess of basis | (92,196) | (2,242,620) | 0
State income taxes, net of federal tax benefit | 522,713 | 196,415 | 595,708
Permanent differences related to stock-based compensation | 27,884 | 0 | 0
Other | 1,371 | (21,604) | (19,754)
Total income tax provision | $ 4,840,664 | $ 9,570,779 | $ 3,444,221
Effective Income Tax Rate Reconciliation, Percent [Abstract] |  |  |
Income tax provision computed at the statutory federal rate | 34.00% | 34.00% | 34.00%
Depletion in excess of basis | (0.70%) | (6.60%) | 0.00%
State income taxes, net of federal tax benefit | 4.10% | 0.60% | 7.10%
Permanent differences related to stock-based compensation | 0.20% | 0.00% | 0.00%
Other | 0.00% | (0.10%) | (0.20%)
Income tax provision | 37.60% | 27.90% | 40.90%

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- Definition Percentage of domestic federal statutory tax rate applicable to pretax income (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 6.I) -URI http://asc.fasb.org/extlink&oid=34349781&loc=d3e330036-122817 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32698-109319 + Details
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- Definition Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to depletion. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 6.I) -URI http://asc.fasb.org/extlink&oid=34349781&loc=d3e330036-122817 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32698-109319 + Details
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