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Stock options (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Weighted-Average Exercise Price
Weighted-Average Exercise Price Outstanding	$ 1.82us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice	$ 0.142us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
Reverse Split		1.71us-gaap_StockRepurchasedAndRetiredDuringPeriodShares
Granted	$ 0us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice	$ 0us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice
Cancelled or Exercised	$ 1.73us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice	$ 1.55us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice
Weighted-Average Exercise Price Outstanding	$ 2.56us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice	$ 1.82us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
Pre Split Options [Member]
Options
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Reverse Split		1,245,000us-gaap_StockIssuedDuringPeriodSharesReverseStockSplits / us-gaap_OptionIndexedToIssuersEquityEquityAxis = EMPR_PreSplitOptionsMember
Granted	0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod / us-gaap_OptionIndexedToIssuersEquityEquityAxis = EMPR_PreSplitOptionsMember	0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod / us-gaap_OptionIndexedToIssuersEquityEquityAxis = EMPR_PreSplitOptionsMember
Cancelled or Exercised	(650,000)us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised / us-gaap_OptionIndexedToIssuersEquityEquityAxis = EMPR_PreSplitOptionsMember	(520,000)us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised / us-gaap_OptionIndexedToIssuersEquityEquityAxis = EMPR_PreSplitOptionsMember
Outstanding Ending	725,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber / us-gaap_OptionIndexedToIssuersEquityEquityAxis = EMPR_PreSplitOptionsMember	725,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber / us-gaap_OptionIndexedToIssuersEquityEquityAxis = EMPR_PreSplitOptionsMember
Post Split Options [Member]
Options
Outstanding Beginning	60,417us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber / us-gaap_OptionIndexedToIssuersEquityEquityAxis = EMPR_PostSplitOptionsMember
Reverse Split		103,750us-gaap_StockIssuedDuringPeriodSharesReverseStockSplits / us-gaap_OptionIndexedToIssuersEquityEquityAxis = EMPR_PostSplitOptionsMember
Granted	0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod / us-gaap_OptionIndexedToIssuersEquityEquityAxis = EMPR_PostSplitOptionsMember	0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod / us-gaap_OptionIndexedToIssuersEquityEquityAxis = EMPR_PostSplitOptionsMember
Cancelled or Exercised	(54,167)us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised / us-gaap_OptionIndexedToIssuersEquityEquityAxis = EMPR_PostSplitOptionsMember	(43,333)us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised / us-gaap_OptionIndexedToIssuersEquityEquityAxis = EMPR_PostSplitOptionsMember
Outstanding Ending	6,250us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber / us-gaap_OptionIndexedToIssuersEquityEquityAxis = EMPR_PostSplitOptionsMember	60,417us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber / us-gaap_OptionIndexedToIssuersEquityEquityAxis = EMPR_PostSplitOptionsMember

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Net number of share options (or share units) granted during the period.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Reduction in the number of shares during the period as a result of a reverse stock split.

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