Quarterly report pursuant to Section 13 or 15(d)

Commitments and Contingencies (Details)

v3.4.0.3
Commitments and Contingencies (Details)
£ in Thousands, AUD in Thousands
 1 Months Ended 9 Months Ended 12 Months Ended
Apr. 27, 2016
km²
Jan. 14, 2013
shares
Jul. 31, 2015
USD ($)
Mar. 31, 2016
USD ($)
Mar. 31, 2016
GBP (£)
Jun. 30, 2015
USD ($)
km²
Jun. 30, 2015
GBP (£)
Apr. 28, 2016
km²
Apr. 15, 2016
USD ($)
Mar. 10, 2016
Nov. 04, 2015
USD ($)
Jun. 30, 2015
AUD
km²
Sep. 30, 2011
USD ($)
Purchase Commitment, Excluding Long-term Commitment [Line Items]                          
Percent of interest in contingent payments                         52.00%
Accrued income taxes       $ 1,800,000   $ 1,700,000              
Note payable       $ 273,000   $ 0              
NT/P82 Seismic Survey, Geotechnical Studies [Member]                          
Purchase Commitment, Excluding Long-term Commitment [Line Items]                          
Other commitment | AUD                       AUD 500  
Area of survey | km²           600           600  
Engagement of RFC Ambrian as financial advisor for farmout of NT/P82                          
Purchase Commitment, Excluding Long-term Commitment [Line Items]                          
Percent of interest in contingent payments                   5.00%      
Cash payment to financial adviser, payment one     $ 20,000                    
Cash payments to financial adviser, payment two     80,000                    
Contingent financial adviser fees     $ 250,000                    
Contingent financial adviser fees, percentage of transaction     5.00%                    
NT/P82 Seismic Survey, Drilling of Exploration Well                          
Purchase Commitment, Excluding Long-term Commitment [Line Items]                          
Other commitment | AUD                       AUD 25,000  
NT/P82 Seismic Survey, Completion of Seismic Survey                          
Purchase Commitment, Excluding Long-term Commitment [Line Items]                          
Other commitment | AUD                       AUD 16,000  
Magellan Petroleum UK (MPUK)                          
Purchase Commitment, Excluding Long-term Commitment [Line Items]                          
Ownership percentage       50.00%                  
Nautilus Purchase and Sale Agreement (PSA)                          
Purchase Commitment, Excluding Long-term Commitment [Line Items]                          
Future contingent production payments payable                         $ 5,000,000
Sopak Collateral Agreement | Common Stock                          
Purchase Commitment, Excluding Long-term Commitment [Line Items]                          
Number of shares available for purchase | shares   1,158,080                      
Sopak Collateral Agreement | Warrant                          
Purchase Commitment, Excluding Long-term Commitment [Line Items]                          
Number of shares available for purchase | shares   543,478                      
Celtique Claim                          
Purchase Commitment, Excluding Long-term Commitment [Line Items]                          
Payment sought by plaintiff       $ 2,200,000 £ 1,500                
Percentage above base rate payment       5.00%                  
Closing costs paid by plaintiff           $ 94,000 £ 60            
Capitalized costs related to petroleum license       $ 871,000                  
MI3 Petroleum Engineering                          
Purchase Commitment, Excluding Long-term Commitment [Line Items]                          
Contingent bonuses payable                     $ 100,000    
Subsequent Event | NT/P82 Seismic Survey, Geotechnical Studies [Member]                          
Purchase Commitment, Excluding Long-term Commitment [Line Items]                          
Area of survey | km² 600             1,000          
Period of suspension 18 months                        
Period of extension 18 months                        
Fairness Opinion, Opinion Fee | Petrie Partners, LLC                          
Loss Contingencies [Line Items]                          
Estimate of possible loss           300,000              
Transaction Closing, Divestiture Transaction Fee | Petrie Partners, LLC                          
Loss Contingencies [Line Items]                          
Estimate of possible loss           450,000              
Business Combination, Transaction Fee | Petrie Partners, LLC                          
Loss Contingencies [Line Items]                          
Estimate of possible loss           800,000              
Business Combination, Transaction Fee, Cash Portion | Petrie Partners, LLC                          
Loss Contingencies [Line Items]                          
Estimate of possible loss           300,000              
Business Combination, Transaction Fee, Stock Portion | Petrie Partners, LLC                          
Loss Contingencies [Line Items]                          
Estimate of possible loss           $ 500,000              
One Stone Exchange Agreement | Subsequent Event | One Stone | Investor                          
Purchase Commitment, Excluding Long-term Commitment [Line Items]                          
Note payable                 $ 625,000        
One Stone Exchange Agreement | Contract Termination, Termination Fee | One Stone | Investor                          
Loss Contingencies [Line Items]                          
Estimate of possible loss       750,000                  
One Stone Exchange Agreement | Contract Termination, Expense Reimbursement | One Stone | Investor                          
Loss Contingencies [Line Items]                          
Estimate of possible loss       $ 200,000