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Stockholders' Equity (Details) (USD $)
In Thousands, except Share data, unless otherwise specified |
9 Months Ended | 12 Months Ended | 0 Months Ended | |
|---|---|---|---|---|
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Mar. 31, 2015
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Jun. 30, 2014
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Jul. 01, 2014
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Oct. 10, 2014
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| Treasury Stock [Roll Forward] | ||||
| Fiscal year opening balance (in shares) | 9,425,114us-gaap_TreasuryStockShares | 9,414,176us-gaap_TreasuryStockShares | 9,425,114us-gaap_TreasuryStockShares | |
| Shares repurchased from former executive (in shares) | 250,000us-gaap_TreasuryStockSharesAcquired | |||
| Net shares repurchased for employee tax and option exercise price obligations related to the vesting of restricted stock and the exercise of employee stock options (in shares) | 47,920us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation | 10,938us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation | ||
| Cancellation of shares repurchased (in shares) | (47,920)us-gaap_TreasuryStockSharesRetired | 0us-gaap_TreasuryStockSharesRetired | ||
| Balance at end of period (in shares) | 9,675,114us-gaap_TreasuryStockShares | 9,425,114us-gaap_TreasuryStockShares | ||
| Fiscal year opening balance | $ 9,344us-gaap_TreasuryStockValue | $ 9,333us-gaap_TreasuryStockValue | 9,344us-gaap_TreasuryStockValue | |
| Shares repurchased from former executive | 462us-gaap_TreasuryStockValueAcquiredCostMethod | |||
| Net shares repurchased for employee tax and option exercise price obligations related to the vesting of restricted stock and the exercise of employee stock options | 104us-gaap_AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation | 11us-gaap_AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation | ||
| Cancellation of shares repurchased | (104)us-gaap_TreasuryStockRetiredCostMethodAmount | 0us-gaap_TreasuryStockRetiredCostMethodAmount | ||
| Balance at end of period | $ 9,806us-gaap_TreasuryStockValue | $ 9,344us-gaap_TreasuryStockValue | ||
| Restricted Stock | ||||
| Class of Stock [Line Items] | ||||
| Vested restricted stock award (in shares) |
150,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember |
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| Treasury Stock [Roll Forward] | ||||
| Net shares repurchased for employee tax and option exercise price obligations related to the vesting of restricted stock and the exercise of employee stock options (in shares) |
47,920us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember |
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| Former Company Executive | ||||
| Class of Stock [Line Items] | ||||
| Shares of common stock repurchased from individual retirement account |
250,000mpet_StockRepurchasedfromIndividualRetirementAccountDuringPeriodShares / us-gaap_TitleOfIndividualAxis = mpet_FormerCompanyExecutiveMember |
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| X | ||||||||||
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- Definition
Stock Repurchased from Individual Retirement Account During Period, Shares No definition available.
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- Details
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| X | ||||||||||
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- Definition
The amount of adjustment to stockholders' equity associated with an employee's income tax withholding obligation as part of a net-share settlement of a share-based award. No definition available.
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| X | ||||||||||
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- Details
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| X | ||||||||||
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- Definition
The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
For net-share settlement of share-based awards when the employer settles employees' income tax withholding obligations, this element represents the number of shares the employees use to repay the employer. No definition available.
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| X | ||||||||||
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- Definition
Amount of decrease of par value, additional paid in capital (APIC) and retained earnings of common and preferred stock retired from treasury when treasury stock is accounted for under the cost method. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Number of common and preferred shares that were previously issued and that were repurchased by the issuing entity and held in treasury on the financial statement date. This stock has no voting rights and receives no dividends. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Number of shares that have been repurchased during the period and are being held in treasury. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Number of shares of common and preferred stock retired from treasury during the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The amount allocated to treasury stock. Treasury stock is common and preferred shares of an entity that were issued, repurchased by the entity, and are held in its treasury. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Equity impact of the cost of common and preferred stock that were repurchased during the period. Recorded using the cost method. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Details
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| X | ||||||||||
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- Details
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