XML 39 R45.htm IDEA: XBRL DOCUMENT v2.4.1.9
Stock-Based Incentive Plan - Stock Options and Incentive Warrants (Details) (USD $)
 9 Months Ended
Mar. 31, 2015
Common Stock  
Additional disclosures of Stock Options and Incentive Warrants  
Market price of common stock on the last trading date of the period (in dollars per share) $ 5.95us-gaap_SharePrice
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonStockMember
Stock Options and Incentive Warrants  
Number of Stock Options and Incentive Warrants  
Stock Options and Incentive Warrants outstanding at the beginning of the period (in shares) 178,061epm_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAndIncentiveWarrantsOutstandingNumber
/ us-gaap_AwardTypeAxis
= epm_StockOptionsAndIncentiveWarrantsMember
Stock Options and Incentive Warrants, Exercised (in shares) (87,000)epm_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAndIncentiveWarrantsExercisesInPeriod
/ us-gaap_AwardTypeAxis
= epm_StockOptionsAndIncentiveWarrantsMember
Stock Options and Incentive Warrants outstanding at the end of the period (in shares) 91,061epm_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAndIncentiveWarrantsOutstandingNumber
/ us-gaap_AwardTypeAxis
= epm_StockOptionsAndIncentiveWarrantsMember
Vested or expected to vest at the end of the period (in shares) 91,061epm_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAndIncentiveWarrantsVestedAndExpectedToVestOutstandingNumber
/ us-gaap_AwardTypeAxis
= epm_StockOptionsAndIncentiveWarrantsMember
Exercisable at the end of the period (in shares) 91,061epm_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAndIncentiveWarrantsExercisableNumber
/ us-gaap_AwardTypeAxis
= epm_StockOptionsAndIncentiveWarrantsMember
Weighted Average Exercise Price  
Stock Options and Incentive Warrants outstanding at the beginning of the period (in dollars per share) $ 2.08epm_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAndIncentiveWarrantsOutstandingWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= epm_StockOptionsAndIncentiveWarrantsMember
Stock Options and Incentive Warrants, Exercised (in dollars per share) $ 1.63epm_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAndIncentiveWarrantsExercisesInPeriodWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= epm_StockOptionsAndIncentiveWarrantsMember
Stock Options and Incentive Warrants outstanding at the end of the period (in dollars per share) $ 2.50epm_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAndIncentiveWarrantsOutstandingWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= epm_StockOptionsAndIncentiveWarrantsMember
Vested or expected to vest at the end of the period (in dollars per share) $ 2.50epm_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAndIncentiveWarrantsVestedAndExpectedToVestOutstandingWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= epm_StockOptionsAndIncentiveWarrantsMember
Exercisable at the end of the period (in dollars per share) $ 2.50epm_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAndIncentiveWarrantsExercisableWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= epm_StockOptionsAndIncentiveWarrantsMember
Stock Options and Incentive Warrants outstanding at the end of the period $ 313,720epm_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAndIncentiveWarrantsOutstandingAggregateIntrinsicValue
/ us-gaap_AwardTypeAxis
= epm_StockOptionsAndIncentiveWarrantsMember		 [1]
Vested or expected to vest at the end of the period 313,720epm_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAndIncentiveWarrantsVestedAndExpectedToVestOutstandingAggregateIntrinsicValue
/ us-gaap_AwardTypeAxis
= epm_StockOptionsAndIncentiveWarrantsMember		 [1]
Exercisable at the end of the period (in dollars) $ 313,720epm_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsAndIncentiveWarrantsExercisableAggregateIntrinsicValue
/ us-gaap_AwardTypeAxis
= epm_StockOptionsAndIncentiveWarrantsMember		 [1]
Stock Options and Incentive Warrants outstanding at the end of the period 1 year 7 months 6 days
Vested or expected to vest at the end of the period 1 year 7 months 6 days
Exercisable at the end of the period 1 year 7 months 6 days
[1] Based upon the difference between the market price of our common stock on the last trading date of the period ($5.95 as of March 31, 2015) and the Stock Option exercise price of in-the-money Stock Options.