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Stock-Based Incentive Plan
 12 Months Ended
Jun. 30, 2013
Stock-Based Incentive Plan  
Stock-Based Incentive Plan

Note 8—Stock-Based Incentive Plan

        We have granted option awards to purchase common stock (the "Stock Options"), restricted common stock awards ("Restricted Stock"), and/or unrestricted fully vested common stock, to employees, directors, and consultants of the Company and its subsidiaries under the Natural Gas Systems Inc. 2003 Stock Plan (the "2003 Stock Plan") and the Evolution Petroleum Corporation Amended and Restated 2004 Stock Plan (the "2004 Stock Plan" or together, the "EPM Stock Plans"). Option awards for the purchase of 600,000 shares of common stock were issued under the 2003 Stock Plan. The 2004 Stock Plan authorized the issuance of 6,500,000 shares of common stock. No shares are available for grant under the 2003 Stock Plan and 800,914 shares remain available for grant under the 2004 Stock Plan as of June 30, 2013.

        We have also granted common stock warrants, as authorized by the Board of Directors, to employees in lieu of cash bonuses or as incentive awards to reward previous service or provide incentives to individuals to acquire a proprietary interest in the Company's success and to remain in the service of the Company (the "Incentive Warrants"). These Incentive Warrants have similar characteristics of the Stock Options. A total of 1,037,500 Incentive Warrants have been issued, with Board of Directors approval, outside of the EPM Stock Plans. We have not issued Incentive Warrants since the listing of our shares on the NYSE MKT (formerly, the American Stock Exchange) in July 2006.

Stock Options and Incentive Warrants

        Non-cash stock-based compensation expense related to Stock Options and Incentive Warrants for the years ended June 30, 2013, 2012 and 2011 was $26,274, $327,776 and $715,027, respectively.

        There were no Stock Options granted during the years ended June 30, 2013, 2012 and 2011.

        The following summary presents information regarding outstanding Stock Options and Incentive Warrants as of June 30, 2013, 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 and Incentive Warrants outstanding at July 1, 2012

     5,372,820   $ 1.83              

Granted

     —     —              

Exercised

     (550,000 ) $ 0.47              

Cancelled or forfeited

     —     —              

Expired

     —     —              
                       

Stock Options and Incentive Warrants outstanding at June 30, 2013

     4,822,820   $ 1.99   $ 43,020,890     2.6  
                   

Vested or expected to vest at June 30, 2013

     4,822,820   $ 1.99   $ 43,020,890     2.6  
                   

Exercisable at June 30, 2013

     4,822,820   $ 1.99   $ 43,020,890     2.6  
                   
(1)
Based upon the difference between the market price of our common stock on the last trading date of the period ($10.91 as of June 30, 2013) and the Stock Option or Incentive Warrant exercise price of in-the-money Stock Options and Incentive Warrants.

        For the year ended June 30, 2013, 550,000 Stock Options exercised with an aggregate intrinsic value of $5,233,480. There were 20,000 Stock Options were exercised during the year ended June 30, 2012, with an aggregate intrinsic value of $54,000. There were 86,875 Stock Options exercised during the year ended June 30, 2011 with an aggregate intrinsic value of $493,923.

        A summary of the status of our unvested Stock Options and Incentive Warrants as of June 30, 2013 and the changes during that year ended are presented below:

 
   Number of
Stock Options
and Incentive
Warrants		   Weighted
Average
Grant-Date
Fair Value		  

Unvested at July 1, 2012

     18,922   $ 2.45  

Granted

     —     —  

Vested

     (18,922 ) $ 2.45  
           

Unvested at June 30, 2013

     —   $ —  
           

        During the years ended June 30, 2013, 2012, and 2011, there were 18,922, 154,955, and 375,580 Stock Options and Incentive Warrants that vested with a total grant date fair value of $46,359, $336,252, and $739,893, respectively.

        There is no unrecognized compensation cost at June 30, 2013, relating to non-vested Stock Options and Incentive Warrants.

Restricted Stock

        Stock-based compensation expense related to Restricted Stock grants for the years ended June 30, 2013, 2012, and 2011 was $1,505,471, $1,148,219, and $820,980, respectively. See Note 7 for a detail of Restricted Stock transactions during the years ended June 30, 2013, 2012, and 2011.

        The following table sets forth the Restricted Stock transactions for the year ended June 30, 2013:

 
   Number of
Restricted
Shares		   Weighted
Average
Grant-Date
Fair Value		  

Unvested at July 1, 2012

     452,600   $ 5.16  

Granted

     211,197   $ 7.88  

Vested

     (277,198 ) $ 5.15  
           

Unvested at June 30, 2013

     386,599   $ 6.65  
           

        During the years ended June 30, 2013, 2012, and 2011, there were 277,198, 239,195, and 206,858 shares of Restricted Stock that vested with a total grant date fair value of $1,427,570, $1,078,769, and $794,335, respectively.

        At June 30, 2013, unrecognized stock compensation expense related to Restricted Stock grants totaled $2,278,014. Such unrecognized expense will be recognized over a weighted average remaining service period of 2.2 years.