|
Basis of Presentation (Details) (USD $)
|
6 Months Ended | |
|---|---|---|
|
Dec. 31, 2014
segment
|
Dec. 31, 2013
|
|
| Schedule of Equity Method Investments [Line Items] | ||
| Impairment on AFS securities | $ 0us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsAvailableforsaleSecurities | $ 0us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsAvailableforsaleSecurities |
| Number of reportable segments | 3us-gaap_NumberOfReportableSegments | |
| Utah CO2 LLC | ||
| Schedule of Equity Method Investments [Line Items] | ||
| Majority interest percentage |
51.00%us-gaap_MinorityInterestOwnershipPercentageByParent / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = mpet_UtahCO2LLCMember |
|
| Central Petroleum Limited | ||
| Schedule of Equity Method Investments [Line Items] | ||
| Ownership percentage |
11.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = mpet_CentralPetroleumLimitedMember |
|
| X | ||||||||||
|
- Definition
The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
The parent entity's interest in net assets of the subsidiary, expressed as a percentage. No definition available.
|
| X | ||||||||||
|
- Definition
Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements. No definition available.
|
| X | ||||||||||
|
- Definition
The amount by which the fair value of an investment in debt and equity securities categorized as Available-for-sale is less than the amortized cost basis or carrying amount of that investment at the balance sheet date and the decline in fair value is deemed to be other than temporary, before considering whether or not such amount is recognized in earnings or other comprehensive income. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Details
|
| X | ||||||||||
|
- Details
|
| X | ||||||||||
|
- Details
|