Annual report pursuant to Section 13 and 15(d)

Subsequent Events (Details)

v3.5.0.2
Subsequent Events (Details)
$ / shares in Units, £ in Thousands, AUD in Millions
 12 Months Ended
Aug. 11, 2016
GBP (£)
shares
Aug. 05, 2016
USD ($)
Aug. 02, 2016
USD ($)
$ / shares
shares
Aug. 01, 2016
USD ($)
shares
Jul. 15, 2016
USD ($)
Jul. 01, 2016
shares
Dec. 31, 2015
shares
Jul. 10, 2015
shares
Jul. 01, 2015
shares
Jul. 01, 2014
shares
Mar. 31, 2014
AUD
Jun. 30, 2016
USD ($)
$ / shares
shares
Jun. 30, 2015
USD ($)
$ / shares
shares
Sep. 09, 2016
GBP (£)
shares
Subsequent Event [Line Items]                            
Current share price (usd per share) | $ / shares                       $ 0.01 $ 0.01  
Capital in excess of par value                       $ 94,069,000 $ 93,386,000  
Share-based compensation expense                       $ 701,000 $ 891,000  
Net shares repurchased for employee tax costs upon vesting of restricted stock (in shares) | shares                       5,220 5,981  
2012 Stock Incentive Plan                            
Subsequent Event [Line Items]                            
Shares, including forfeited shares, available for future issuance | shares                       306,481    
Amadeus Basin                            
Subsequent Event [Line Items]                            
Net cash proceeds from sale | AUD                     AUD 20.0      
Restricted Stock                            
Subsequent Event [Line Items]                            
Share-based compensation expense                         $ (67,000)  
Shares vested (in shares) | shares             7,500   12,500 18,750        
Net shares repurchased for employee tax costs upon vesting of restricted stock (in shares) | shares             2,398   2,822 5,981        
RSUs                            
Subsequent Event [Line Items]                            
Net shares repurchased for employee tax costs upon vesting of restricted stock (in shares) | shares               2,284            
Subsequent Event                            
Subsequent Event [Line Items]                            
Paid in kind dividends | shares       22,815,748                    
Subsequent Event | Celtique Litigation                            
Subsequent Event [Line Items]                            
Litigation settlement, amount | £ £ 500                          
Subsequent Event | Chief Executive Officer                            
Subsequent Event [Line Items]                            
Severance costs   $ 300,000                        
Officers' compensation   106,000                        
Reimbursement of medical expenses   $ 35,000                        
Subsequent Event | 2012 Omnibus Incentive Compensation Plan | Non-employee Directors                            
Subsequent Event [Line Items]                            
Common stock, issued (in shares) | shares     119,505                      
Directors fees     $ 201,000                      
Subsequent Event | 2012 Stock Incentive Plan                            
Subsequent Event [Line Items]                            
Shares, including forfeited shares, available for future issuance | shares                           67,471
Subsequent Event | Employee Retention Cash Bonus Plan | Employees | Bonus Contingent Upon Filing of 10K                            
Subsequent Event [Line Items]                            
Compensation         $ 108,000                  
Subsequent Event | PBOs and MBOs                            
Subsequent Event [Line Items]                            
Share-based compensation expense       $ 235,000                    
Subsequent Event | Restricted Stock                            
Subsequent Event [Line Items]                            
Shares vested (in shares) | shares           12,500                
Net shares repurchased for employee tax costs upon vesting of restricted stock (in shares) | shares           2,529                
Subsequent Event | One Stone Exchange Agreement | One Stone | Investor                            
Subsequent Event [Line Items]                            
Amount due from related party       900,000                    
Subsequent Event | One Stone Exchange Agreement | One Stone | Director                            
Subsequent Event [Line Items]                            
Fees forgiven, related parties       $ 174,000                    
Subsequent Event | Subsidiary | Celtique Litigation                            
Subsequent Event [Line Items]                            
Litigation settlement, amount | £ 500                          
Subsequent Event | Subsidiary | Weald ATA, IoW ATA, and Settlement Agreement                            
Subsequent Event [Line Items]                            
Net cash proceeds from sale | £ £ 446                          
Subsequent Event | Subsidiary | UKOG | UK Oil and Gas Investments | Weald ATA, IoW ATA, and Settlement Agreement                            
Subsequent Event [Line Items]                            
Investment owned (in shares) | shares 50,900,000                          
Investment owned, value | £ £ 703                         £ 958
Subsequent Event | Merger Agreement                            
Subsequent Event [Line Items]                            
Common stock, exchange of shares, shares (per share)     1.300                      
Subsequent Event | Merger Agreement | Tellurian                            
Subsequent Event [Line Items]                            
Current share price (usd per share) | $ / shares     $ 0.001                      
Termination fee maximum     $ 1,000,000                      
Reverse termination fee     1,000,000                      
Subsequent Event | Merger Agreement | Tellurian | Director                            
Subsequent Event [Line Items]                            
Directors fees     $ 150,000                      
Shares issuable upon closing of Merger (in shares) | shares     100,000