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Stock-Based Incentive Plan - Narrative (Details) (USD $)
 3 Months Ended 12 Months Ended 0 Months Ended 12 Months Ended 3 Months Ended
Dec. 31, 2013
Jun. 30, 2014
Employee Stock Option
Jun. 30, 2013
Employee Stock Option
Jun. 30, 2012
Employee Stock Option
Jun. 30, 2014
Stock Options and Incentive Warrants
Jun. 30, 2013
Stock Options and Incentive Warrants
Jun. 30, 2012
Stock Options and Incentive Warrants
Jun. 30, 2014
Restricted Stock
Jun. 30, 2013
Restricted Stock
Jun. 30, 2012
Restricted Stock
Jun. 30, 2014
Evolution Petroleum Corporation Amended and Restated 2004 Stock Plan
Sep. 06, 2012
Evolution Petroleum Corporation Amended and Restated 2004 Stock Plan
Restricted Stock
Aug. 31, 2011
Evolution Petroleum Corporation Amended and Restated 2004 Stock Plan
Restricted Stock
Jun. 30, 2014
Restructuring Charges
Jun. 30, 2013
Restructuring Charges
Jun. 30, 2012
Restructuring Charges
Dec. 31, 2013
Restructuring Charges
Stock Compensation, Restructuring
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                  
Options and Incentive Warrants, Grants (in shares)   0 0 0 0                        
Restricted stock, vested (shares)               277,198 277,198 239,195              
Options, Exercised, Intrinsic Value   $ 47,504,114 $ 5,233,480 $ 54,000                          
Exercise of stock options (shares)   4,644,759 550,000 20,000                          
Shares authorized for granting (shares)                     6,500,000            
Shares available for grant (shares)                     812,281            
Non-cash stock-based compensation expense 800,000       0 26,274 327,776 1,728,687 1,505,471 1,148,219       376,365 0 0 376,365
Options and Incentive Warrants Vested in Period         0 18,922 154,955                    
Options and Incentive Warrants, vested in period, grant date, fair value         0 46,359 336,252                    
Restricted stock, vested in period, grant date fair value               1,796,243 1,427,570 1,078,769              
Restricted stock compensation not yet recognized               $ 997,403       $ 1,223,020 $ 1,029,436        
Recognition period for restricted stock compensation expense not yet recognized               2 years 1 month 6 days       4 years 4 years