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Stock-Based Incentive Plan - Narrative (Details) - USD ($)	3 Months Ended	12 Months Ended
	Dec. 31, 2013	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise of stock options (shares)		87,000		550,000
Options, Exercised, Intrinsic Value		$ 501,810		$ 5,233,480
Non-cash stock-based compensation expense	$ 800,000
Employee Stock Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options and Incentive Warrants, Grants (in shares)		0	0	0
Stock Options and Incentive Warrants
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise of stock options (shares)			4,644,759
Options, Exercised, Intrinsic Value			$ 47,504,114
Options and Incentive Warrants Vested in Period		0	0	18,922
Options and Incentive Warrants, vested in period, grant date, fair value		$ 0	$ 0	$ 46,359
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock, vested (shares)		91,306	277,198	277,198
Restricted stock, vested in period, grant date fair value		$ 766,970	$ 1,796,243	$ 1,427,570
Non-cash stock-based compensation expense		962,813	$ 1,728,687	$ 1,531,745
Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Cash dividends paid		$ 19,160
Evolution Petroleum Corporation Amended and Restated 2004 Stock Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares authorized for granting (shares)		6,500,000
Shares available for grant (shares)		542,529
Minimum | Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value at grant date, per share		$ 4.26
Vesting period		3 years 3 months 18 days
Maximum | Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value at grant date, per share		$ 8.40
Vesting period		2 years 6 months 18 days

X

- Definition

The total fair value as of the grant date of equity-based awards for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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Gross number of share options (or share units) and Incentive Warrants granted during the period.

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The number of Stock Options and Incentive Warrants that vested during the reporting period.

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Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

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