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Income Taxes - Reconciliation of Statutory and Income Tax Expense (Details) - USD ($)
 12 Months Ended
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%)