Quarterly report pursuant to Section 13 or 15(d)

Securities Available-for-Sale (Details)

v3.5.0.2
Securities Available-for-Sale (Details) - USD ($)
$ in Thousands, shares in Millions
12 Months Ended
Jun. 30, 2016
Sep. 30, 2016
Aug. 11, 2016
Apr. 15, 2016
Schedule of Available-for-sale Securities [Line Items]        
Amortized cost $ 885 $ 1,810    
Gross unrealized gains 0 279    
Gross unrealized losses (284) (191)    
Fair value 601 1,898    
Notes payable 783 $ 104    
One Stone | One Stone Exchange Agreement | Investor        
Schedule of Available-for-sale Securities [Line Items]        
Notes payable       $ 625
Central Petroleum Limited        
Schedule of Available-for-sale Securities [Line Items]        
Impairment on AFS securities $ 14,900      
Weald ATA, IoW ATA, and Settlement Agreement | Subsidiaries | UK Oil and Gas Investments PLC | UK Oil and Gas Investments        
Schedule of Available-for-sale Securities [Line Items]        
Shares issued (in shares)     50.9