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Stock-Based Incentive Plan (Notes) | 3 Months Ended
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Sep. 30, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Stock-Based Incentive Plan | Stock-Based Incentive Plan We may grant option awards to purchase common stock (the "Stock Options"), restricted common stock awards ("Restricted Stock"), and unrestricted fully vested common stock, to employees, directors, and consultants of the Company under the Evolution Petroleum Corporation Amended and Restated 2004 Stock Plan (the "Plan"). The Plan authorizes the issuance of 6,500,000 shares of common stock and 568,269 shares remain available for grant as of September 30, 2014. Stock Options No Stock Options have been granted since August 2008 and all compensation costs attributable to Stock Options have been recognized in prior periods. The following summary presents information regarding outstanding Stock Options as of September 30, 2014, and the changes during the fiscal year:
| Number of Stock Options and Incentive Warrants |  | Weighted Average Exercise Price |  | Aggregate Intrinsic Value (1) |  | Weighted Average Remaining Contractual Term (in years)
Stock Options outstanding at July 1, 2014 | 178,061 |  |  | $ | 2.08 |  |  |  |  |  |
Stock Options outstanding at September 30, 2014 | 178,061 |  |  | $ | 2.08 |  |  | $ | 1,264,907 |  |  | 1.5
Vested or expected to vest at September 30, 2014 | 178,061 |  |  | $ | 2.08 |  |  | $ | 1,264,907 |  |  | 1.5
Exercisable at September 30, 2014 | 178,061 |  |  | $ | 2.08 |  |  | $ | 1,264,907 |  |  | 1.5
(1) Based upon the difference between the market price of our common stock on the last trading date of the period ($9.18 as of September 30, 2014) and the Stock Option exercise price of in-the-money Stock Options. Restricted Stock and Contingent Restricted Stock Prior to the quarter ended September 30, 2014 all restricted stock grants contained a four-year vesting period based solely on service. Restricted stock which vests based solely on service is valued at the fair market value on the date of grant and amortized over the service period. During the three months ended September 30, 2014, the Company awarded long-term incentive grants of both restricted stock and contingent restricted stock. Such grants, which expire after four years if unvested, contain service-based, performance-based and market-based vesting provisions. The common shares underlying the restricted stock grants were issued on the date of grant, whereas the contingent restricted stock will be issued only upon the attainment of specified performance-based or market-based vesting provisions. Performance-based grants vest upon the attainment of earnings, revenue and other operational goals and require that the recipient remain an employee of the Company upon vesting. The Company recognizes compensation expense for performance-based awards ratably over the expected vesting period when it is deemed probable, for accounting purposes, that the performance criteria will be achieved. The expected vesting period may be deemed to be shorter than the remainder of the four year term. As of September 30, 2014, the Company does not consider the vesting of these performance-based grants to be probable and no compensation expense has been recognized. Market-based awards entitle employees to vest in a fixed number of shares when the three-year trailing total return on the Company’s common stock exceeds the corresponding total returns of various quartiles of companies comprising the SIG Exploration and Production Index (NASDAQ EPX) during defined measurement periods. The fair value and expected vesting period of these awards was determined using a Monte Carlo simulation based on the historical volatility of the Company's total return compared to the historical volatilities of the other companies in the index. Fair values for these market-based awards ranged from $4.26 to $8.40 with expected vesting periods of 3.30 to 2.55 years, based on the various quartiles of comparative market performance. Compensation expense for market-based awards is recognized over the expected vesting period using the straight-line method, so long as the award holder remains an employee of the Company. Total compensation expense is based on the fair value of the awards at the date of grant and is independent of vesting or expiration of the awards, except for termination of service. The following table sets forth the Restricted Stock transactions for the three months ended September 30, 2014:
| Number of Restricted Shares |  | Weighted Average Grant-Date Fair Value |  | Unamortized Compensation Expense at September 30, 2014 (1) |  | Weighted Average Remaining Amortization Period (Years)
Unvested at July 1, 2014 | 140,067 |  |  | $ | 8.70 |  |  |  |  |
Service-based shares granted | 75,170 |  |  | 10.13 |  |  |  |  |
Performance-based shares granted | 76,642 |  |  | 10.05 |  |  |  |  |
Market-based shares granted | 35,914 |  |  | 7.59 |  |  |  |  |
Vested | (21,873 | ) |  | 6.86 |  |  |  |  |
Unvested at September 30, 2014 | 305,920 |  |  | $ | 9.39 |  |  | $ | 1,789,833 |  |  | 2.9
(1) Excludes $770,252 of potential future compensation expense for performance-based awards that are not probable. The following table summarizes Contingent Restricted Stock activity:
| Number of Restricted Stock Units |  | Weighted Average Grant-Date Fair Value |  | Unamortized Compensation Expense at September 30, 2014 (1) |  | Weighted Average Remaining Amortization Period (Years)
Unvested at July 1, 2014 | — |  |  | $ | — |  |  |  |  |
Performance-based awards granted | 38,325 |  |  | 10.05 |  |  |  |  |
Market-based awards granted | 17,961 |  |  | 4.26 |  |  |  |  |
Unvested at September 30, 2014 | 56,286 |  |  | $ | 8.20 |  |  | $ | 74,502 |  |  | 3.2
(1) Excludes $385,166 of potential future compensation expense for performance-based awards that are not probable. Stock-based compensation expense related to Restricted Stock and Contingent Restricted Stock grants for the three months ended September 30, 2014 and 2013 was $243,337 and $373,438, respectively.

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- Definition The entire disclosure for compensation-related costs for equity-based compensation, which may include disclosure of policies, compensation plan details, allocation of equity compensation, incentive distributions, equity-based arrangements to obtain goods and services, deferred compensation arrangements, employee stock ownership plan details and employee stock purchase plan details. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -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 505 -SubTopic 50 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6406099&loc=d3e25284-112666 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 40 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6418621&loc=d3e17540-113929 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5444-113901 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 + Details
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