Quarterly report pursuant to Section 13 or 15(d)

Consolidated Statement of Changes in Equity

v2.4.1.9
Consolidated Statement of Changes in Equity (USD $)
In Thousands, unless otherwise specified
Total
Common Stock
Treasury Stock
Capital in Excess of Par Value
Accumulated Deficit
Accumulated Other Comprehensive Loss
Non-controlling Interest
Beginning balance at Jun. 30, 2014 $ 45,917us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest $ 550us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
$ (9,344)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_TreasuryStockMember
$ 92,986us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
$ (36,266)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
$ (2,009)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember
$ 0us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Formation of Utah CO2 LLC 96us-gaap_NoncontrollingInterestIncreaseFromBusinessCombination           96us-gaap_NoncontrollingInterestIncreaseFromBusinessCombination
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember
Contributions to Utah CO2 LLC 85us-gaap_NoncontrollingInterestIncreaseFromSubsidiaryEquityIssuance           85us-gaap_NoncontrollingInterestIncreaseFromSubsidiaryEquityIssuance
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember
Net loss (5,513)us-gaap_ProfitLoss       (5,343)us-gaap_ProfitLoss
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
  (170)us-gaap_ProfitLoss
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember
Other comprehensive loss, net of tax (9,605)us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest         (9,605)us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember
 
Stock and stock based compensation 901us-gaap_StockGrantedDuringPeriodValueSharebasedCompensation 2us-gaap_StockGrantedDuringPeriodValueSharebasedCompensation
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
  899us-gaap_StockGrantedDuringPeriodValueSharebasedCompensation
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
     
Executive and employee forfeiture of options upon resignation (430)mpet_SharebasedCompensationArrangementbySharebasedPaymentAwardOptionsForfeituresinPeriodValue     (430)mpet_SharebasedCompensationArrangementbySharebasedPaymentAwardOptionsForfeituresinPeriodValue
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
     
Executive forfeiture of restricted stock upon resignation (44)us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardForfeitures (1)us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardForfeitures
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
  (43)us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardForfeitures
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
     
Purchase of stock and options from former executive (1,445)us-gaap_StockRepurchasedDuringPeriodValue   (462)us-gaap_StockRepurchasedDuringPeriodValue
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_TreasuryStockMember
(983)us-gaap_StockRepurchasedDuringPeriodValue
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
     
Net shares repurchased for employee tax costs upon vesting of restricted stock (104)us-gaap_AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation     (104)us-gaap_AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
     
Stock options exercised, net of shares withheld to satisfy employee tax obligations 115us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised 3us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
  112us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
     
Preferred stock dividend (859)us-gaap_DividendsPreferredStock       (859)us-gaap_DividendsPreferredStock
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
   
Ending balance at Dec. 31, 2014 $ 29,114us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest $ 554us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
$ (9,806)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_TreasuryStockMember
$ 92,437us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
$ (42,468)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
$ (11,614)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember
$ 11us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember