Consolidated Condensed Statements of Cash Flows (USD $)	6 Months Ended
Dec. 31, 2014	Dec. 31, 2013
Cash flows from operating activities
Net income attributable to the Company	$ 2,368,928us-gaap_NetIncomeLoss	$ 1,063,568us-gaap_NetIncomeLoss
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, depletion and amortization	1,311,425	657,265
Stock-based compensation	488,357us-gaap_ShareBasedCompensation	689,860us-gaap_ShareBasedCompensation
Stock-based compensation related to restructuring	0	376,365
Accretion of discount on asset retirement obligations	12,773	25,346
Settlements of asset retirement obligations	(220,522)	(57,247)
Deferred income taxes	656,589us-gaap_DeferredIncomeTaxExpenseBenefit	329,667us-gaap_DeferredIncomeTaxExpenseBenefit
Deferred rent	(8,574)epm_DeferredRent	(8,574)epm_DeferredRent
Changes in operating assets and liabilities:
Receivables from oil and natural gas sales	(1,454,866)us-gaap_IncreaseDecreaseInReceivables	135,292us-gaap_IncreaseDecreaseInReceivables
Receivables from income taxes and other	(12,492)	(11,170)
Due from joint interest partner	0	4,687
Prepaid expenses and other current assets	69,697	(367,426)
Accounts payable and accrued expenses	1,384,201	222,968
Income taxes payable	45,392	(233,548)
Net cash provided by operating activities	4,640,908	2,827,053
Cash flows from investing activities
Proceeds from asset sales	389,166	544,442
Capital expenditures for oil and natural gas properties	(1,136)	(856,943)
Capital expenditures for other property and equipment	(311,075)	(9,637)
Other assets	(84,341)	(5,957)
Net cash used in investing activities	(7,386)	(328,095)
Cash flows from financing activities
Proceeds on exercise of stock options	51,600	2,141,500
Cash dividends to preferred stockholders	(337,151)	(337,151)
Cash dividends to common stockholders	(6,565,350)us-gaap_PaymentsOfDividendsCommonStock	(3,205,135)us-gaap_PaymentsOfDividendsCommonStock
Acquisitions of treasury stock	(58,660)	(1,127,801)
Tax benefits related to stock-based compensation	921,581	386,976
Maturity of certificate of deposit	0	250,000
Recovery of short swing profits	(62,958)	0
Deferred loan costs	66us-gaap_PaymentsOfDebtIssuanceCosts	6,850us-gaap_PaymentsOfDebtIssuanceCosts
Net cash used in financing activities	(6,050,872)	(1,884,761)
Net increase (decrease) in cash and cash equivalents	(1,417,350)	614,197
Cash and cash equivalents, beginning of period	23,940,514	24,928,585
Cash and cash equivalents, end of period	22,523,164	25,542,782
Supplemental disclosures of cash flow information:
Income taxes paid	100,000us-gaap_IncomeTaxesPaid	755,564us-gaap_IncomeTaxesPaid
Non-cash transactions:
Change in accounts payable used to acquire property and equipment	1,410,420	(223,846)
Oil and natural gas property costs incurred through recognition of asset retirement obligations	562,482	48,988
Previously acquired Company common shares swapped by holders to pay stock option exercise price	$ 0	$ 618,606

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The net cash impact recognized in the current period that allocates the cost of tangible assets, intangible assets, or depleting assets to periods that benefit from use of the assets.

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Represents the previously acquired shares swapped by holder to pay stock option exercise price (noncash or part noncash) consideration. Noncash is defined as transactions during a period that affect recognized assets or liabilities but that do not result in cash receipts or cash payments in the period. Part noncash refers to that portion of the transaction not resulting in cash receipts or cash payments in the period.

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This element represents oil and natural gas properties incurred through recognition of asset retirement obligations settlement transactions that were settled using noncash vehicles.

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Amount of stock compensation expenses associated with exit or disposal activities pursuant to an authorized plan.

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Amount of accretion expense recognized during the period that is associated with an asset retirement obligation. Accretion expense measures and incorporates changes due to the passage of time into the carrying amount of the liability.

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Amount of cash paid during the period to settle an asset retirement obligation. Amounts paid to settle an asset retirement obligation are generally included in the operating section of the Statement of Cash Flows.

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Future cash outflow to pay for purchases of fixed assets that have occurred.

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Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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Amount of deferred income tax expense (benefit) pertaining to income (loss) from continuing operations.

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Amount of cash inflow from realized tax benefit related to deductible compensation cost reported on the entity's tax return for equity instruments in excess of the compensation cost for those instruments recognized for financial reporting purposes.

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The amount of cash paid during the current period to foreign, federal, state, and local authorities as taxes on income.

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The increase (decrease) during the reporting period in the amounts payable to vendors for goods and services received and the amount of obligations and expenses incurred but not paid.

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The increase (decrease) during the reporting period of all taxes owed but not paid, including income, property and other taxes.

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No definition available.

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The increase (decrease) during the reporting period in current receivables (due within one year or one operating cycle) to be collected from an entity that is controlling, under the control of, or within the same control group as the reporting entity by means of direct or indirect ownership.

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The increase (decrease) during the reporting period in income taxes receivable, which represents the amount due from tax authorities for refunds of overpayments or recoveries of income taxes paid.

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The increase (decrease) during the reporting period in the value of prepaid expenses and other assets not separately disclosed in the statement of cash flows, for example, deferred expenses, intangible assets, or income taxes.

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The increase (decrease) during the reporting period in the total amount due within one year (or one operating cycle) from all parties, associated with underlying transactions that are classified as operating activities.

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The increase (decrease) in cash associated with the entity's continuing operating, investing, and financing activities. While for technical reasons this element has no balance attribute, the default assumption is a debit balance consistent with its label.

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No definition available.

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Amount of cash inflow (outflow) of financing activities, excluding discontinued operations. Financing activity cash flows include obtaining resources from owners and providing them with a return on, and a return of, their investment; borrowing money and repaying amounts borrowed, or settling the obligation; and obtaining and paying for other resources obtained from creditors on long-term credit.

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Amount of cash inflow (outflow) of investing activities, excluding discontinued operations. Investing activity cash flows include making and collecting loans and acquiring and disposing of debt or equity instruments and property, plant, and equipment and other productive assets.

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Amount of cash inflow (outflow) from operating activities, excluding discontinued operations. Operating activity cash flows include transactions, adjustments, and changes in value not defined as investing or financing activities.

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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Balance Type:	credit
Period Type:	duration

- Definition

The cash outflow for acquisition of or capital improvements of property, plant and equipment, used to produce goods or deliver services, and not otherwise defined in the taxonomy.

+ References

+ Details

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Period Type:	duration

- Definition

The cash inflow from the sale of property, plant and equipment (capital expenditures), software, and other intangible assets.

+ References

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
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Period Type:	duration

- Definition

The cash inflow associated with the amount received from holders exercising their stock options. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (j)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 14

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3255-108585

+ Details

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- Definition

The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

+ References

+ Details

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- Details

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