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Income Taxes - Reconciliation of Statutory and Income Tax Expense (Details) - USD ($) | 12 Months Ended
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Jun. 30, 2019 | Jun. 30, 2018
Effective Income Tax Rate Reconciliation, Amount [Abstract] |  |
Income tax provision (benefit) computed at the statutory federal rate | $ 3,960,480 | $ 4,459,940
Adjustment of deferred income liability for the Tax Act's lower statutory federal tax rate | 0 | (5,949,389)
Change in valuation allowance due to enactment of the Tax Act | 0 | (111,818)
Expiration of Section 382 tax loss carryforwards | 127,410 | 0
Change in valuation allowance for Section 382 tax loss carryforwards | (127,410) | 0
Depletion in excess of tax basis | (982,302) | (2,433,530)
State income taxes, net of federal tax benefit | 593,533 | 718,337
Permanent differences related to stock-based compensation | (73,671) | (139,333)
Other | (15,679) | 23,824
Total income tax provision | $ 3,482,361 | $ (3,431,969)
Effective Income Tax Rate Reconciliation, Percent [Abstract] |  |
Income tax (benefit) provision computed at the statutory federal rate | 21.00% | 27.55%
Adjustment of deferred income liability for the Tax Act's lower statutory federal tax rate | 0.00% | (36.80%)
Change in valuation allowance due to enactment of the Tax Act | 0.00% | (0.70%)
Expiration of Section 382 tax loss carryforwards | 0.70% | 0.00%
Change in valuation allowance for Section 382 tax loss carryforwards | (0.70%) | 0.00%
Depletion in excess of tax basis | (5.10%) | (14.90%)
State income taxes, net of federal tax benefit | 3.10% | 4.40%
Permanent differences related to stock-based compensation | (0.40%) | (0.90%)
Other | (0.10%) | 0.10%
Income tax (benefit) provision | 18.50% | (21.20%)

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