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Accrued Liabilities and Other (Details) - USD ($)
Dec. 31, 2018
Jun. 30, 2018
Other Liabilities, Current [Abstract]    
Accrued incentive and other compensation $ 217,171 $ 415,182
Accrued severance payments 0 160,089
Asset retirement obligations due within one year 35,539 35,539
Accrued royalties, including suspended accounts 11,498 11,498
Accrued franchise taxes 99,000 162,805
Accrued ad valorem taxes 0 89,773
Accrued liabilities and other $ 363,208 $ 874,886