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Supplemental Disclosures about Oil and Natural Gas Producing Properties (unaudited) - Roll Forward of Changes in Standardized Measure of Discount Future Cash Flows on Proved Crude Oil, Natural Gas Liquids, and Natural Gas Reserves (Details) - USD ($) | 12 Months Ended
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Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2016
Changes in the standardized measure of discounted future net cash flows applicable to proved crude oil, natural gas liquids, and natural gas reserves |  |  |
Balance, beginning of year | $ 82,937,553 | $ 77,957,319 | $ 159,196,539
Net changes in sales prices and production costs related to future production | 62,011,112 | 19,821,288 | (120,832,747)
Changes in estimated future development costs | 267,547 | (1,626,833) | 74,991
Sales of oil and gas produced during the period, net of production costs | (29,087,710) | (23,649,087) | (17,079,363)
Net change due to extensions, discoveries, and improved recovery | 0 | 0 | 0
Net change due to revisions in quantity estimates | 888,896 | (2,206,287) | (18,821,014)
Net change due to sales of minerals in place | 0 | 0 | 0
Development costs incurred during the period | 0 | 2,632,547 | 16,327,883
Accretion of discount | 11,089,455 | 10,086,904 | 21,870,650
Net change in discounted income taxes | 871,540 | (5,045,279) | 36,598,239
Net changes in timing of production and other | (10,019,979) | 4,966,981 | 622,141
Balance, end of year | $ 118,958,414 | $ 82,937,553 | $ 77,957,319

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- Definition Amount of increase (decrease) in standardized measure of discounted future net cash flow as a result of extensions, discoveries and improved recovery of proved oil and gas reserves. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher SEC -Name Form 20-F -Section Item 18 -Subsection Instruction 2 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 35A -URI http://asc.fasb.org/extlink&oid=68064819&loc=SL6807758-109447 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 55 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=34713648&loc=d3e63123-109448 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 35 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=68064819&loc=d3e62500-109447 + Details
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- Definition Amount of increase (decrease) in standardized measure of discounted future net cash flow as a result of change in the estimated future income tax on future pretax net cash flows related to the entity's proved oil and gas reserves. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher SEC -Name Form 20-F -Section Item 18 -Subsection Instruction 2 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 35 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=68064819&loc=d3e62500-109447 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 55 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=34713648&loc=d3e63123-109448 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 35A -URI http://asc.fasb.org/extlink&oid=68064819&loc=SL6807758-109447 + Details
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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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