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ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES - Status of Our Business - Liquidity and Going Concern (Details)
3 Months Ended 9 Months Ended
May 20, 2017
USD ($)
Apr. 26, 2017
$ / shares
shares
Apr. 26, 2017
USD ($)
$ / shares
Apr. 18, 2017
$ / shares
shares
Apr. 12, 2017
USD ($)
km²
Mar. 30, 2017
USD ($)
Mar. 28, 2017
USD ($)
$ / shares
shares
Mar. 17, 2017
USD ($)
shares
Mar. 01, 2017
USD ($)
Jan. 29, 2017
USD ($)
Jan. 24, 2017
USD ($)
Sep. 15, 2016
USD ($)
km²
item
m
Aug. 19, 2016
USD ($)
km²
m
Aug. 15, 2016
USD ($)
Jun. 30, 2017
USD ($)
item
$ / shares
shares
Mar. 31, 2017
USD ($)
m
$ / shares
Jun. 30, 2016
$ / shares
Dec. 31, 2012
Jun. 30, 2010
Status of our Business                                      
Stated value per share | $ / shares                               $ 0.001 $ 0.001    
Payments of Stock Issuance Costs                               $ 210,000      
Series A Preferred Stock | Private Placement Offering                                      
Status of our Business                                      
Stated value per share | $ / shares             $ 0.001                        
Exercise price (in dollars per share) | $ / shares             $ 3.50                        
Aggregate shares of common stock issued | shares             511 680                      
Series A Preferred Stock | Private Placement Offering | Subsequent Event                                      
Status of our Business                                      
Number Of Closings Of A Private Placement Offering | item                             4        
Aggregate number of units issued | shares                             1,951        
Purchase price per unit | $ / shares                             $ 1,000        
Stated value per share | $ / shares   $ 0.001 $ 0.001 $ 0.001                     $ 1,040        
Number of shares each warrant can purchase | shares                             223        
Exercise price (in dollars per share) | $ / shares                             $ 3.50        
Aggregate cash proceeds from sale of units     $ 760,000                       $ 1,951,000        
Aggregate shares of common stock issued | shares   50   710                     435,073        
Tullow and Dana                                      
Status of our Business                                      
Minimum ultra deepwater depth (in meters) | m                               2,000      
Tullow and Dana | Settlement Agreement                                      
Status of our Business                                      
Ownership interest (as a percent)                           100.00%          
Settlement amount                           $ 700,000          
SAPETRO | Farm-out Agreement                                      
Status of our Business                                      
Ownership interest sold (as a percent)           50.00%                          
Subsidiary of Pacific Operations Drilling Limited | Offshore Drilling Contract | Subsequent Event                                      
Status of our Business                                      
Mobilization and Standby Rate ("SMSR") per day $ 100,000                                    
Notice for drilling commencement (in days) 28 days                                    
Value of common stock issuable $ 1,000,000                                    
Average market price (in days) 10 days                                    
Placement Agent | Series A Preferred Stock | Private Placement Offering                                      
Status of our Business                                      
Number of shares each warrant can purchase | shares             13,528                        
Payments of Stock Issuance Costs             $ 45,990 $ 61,200                      
Placement Agent | Series A Preferred Stock | Private Placement Offering | Subsequent Event                                      
Status of our Business                                      
Aggregate shares of common stock issued | shares                             51,650        
Payments of Stock Issuance Costs     $ 68,400                       $ 175,555        
Guinea concession                                      
Status of our Business                                      
Ownership interest (as a percent)                       100.00%         37.00%    
Cash proceeds from Tullow                               $ 26,000,000      
Gross expenditure cap                               100,000,000      
Threshold gross expenditure cap for well to be paid by the entity                               100,000,000      
Extension period for second exploration (in years)                       1 year              
Number of exploratory wells drilled | item                       1              
Depth below seabed required to be drilled of an exploration well (in meters) | m                       2,500 2,500            
Contract area retained (in square kilometers/square miles) | km²                       5,000 5,000            
Maximum period of time over which current available liquidity could be exhausted                       30 days              
Estimated amount to limit cost recovery to share of expenditures                         $ 165,000,000            
Total value of oil and gas equipment stored at Takoradi, Ghana                   $ 4,100,000   $ 4,100,000              
Portion of oil and gas equipment moved from Takoradi, Ghana to Guinea                   $ 1,600,000   1,600,000              
Agreed amount in training budget                       250,000 250,000            
Estimated amount of unused portion of training program                         $ 400,000     400,000      
Mutually acceptable security                 $ 5,000,000   $ 5,000,000         $ 5,000,000      
Guinea concession | Settlement Agreement                                      
Status of our Business                                      
Estimated amount to limit cost recovery to share of expenditures                       $ 165,000,000              
Guinea concession | Farm-out Agreement | Subsequent Event                                      
Status of our Business                                      
Contract area retained (in square kilometers/square miles) | km²         5,000                            
Mutually acceptable security         $ 5,000,000                            
Maximum Day For Security Instrument To Put In Place         30 days                            
Guinea concession | Tullow Guinea Ltd                                      
Status of our Business                                      
Ownership interest sold (as a percent)                                   40.00%  
Guinea concession | SAPETRO | Farm-out Agreement                                      
Status of our Business                                      
Ownership interest sold (as a percent)           50.00%                          
Sufficient financing for the Obligation Well Cost         $ 15,000,000                            
Guinea concession | SAPETRO | Farm-out Agreement | Subsequent Event                                      
Status of our Business                                      
Ownership interest (as a percent)         2.00%                            
Ownership interest sold (as a percent)         50.00%                            
Contract area retained (in square kilometers/square miles) | km²         5,000                            
Mutually acceptable security         $ 5,000,000                            
Participation interest in joint venture         50.00%                            
Maximum Day For Security Instrument To Put In Place         30 days                            
Sufficient financing for the Obligation Well Cost         $ 15,000,000                            
Threshold amount for additional assigned 2% participating interest         $ 1,000,000                            
Guinea concession | SAPETRO | Farm-out Agreement | Maximum                                      
Status of our Business                                      
Estimated total drilling preparation cost           $ 10,000,000                          
Guinea concession | SAPETRO | Farm-out Agreement | Minimum                                      
Status of our Business                                      
Estimated total drilling preparation cost           $ 8,000,000                          
Guinea concession | Dana                                      
Status of our Business                                      
Ownership interest (as a percent)                                     23.00%