Annual report pursuant to Section 13 and 15(d)

Securities Available-for-Sale (Details)

v3.5.0.2
Securities Available-for-Sale (Details)
£ in Thousands, $ in Thousands
12 Months Ended
Jun. 30, 2015
USD ($)
Sep. 09, 2016
GBP (£)
Aug. 11, 2016
GBP (£)
Jun. 30, 2016
USD ($)
Apr. 15, 2016
USD ($)
Schedule of Available-for-sale Securities [Line Items]          
Amortized cost $ 4,230     $ 885  
Gross unrealized gains 0     0  
Gross unrealized losses 0     (284)  
Fair value 4,230     601  
Notes payable 0     $ 783  
One Stone | Investor | One Stone Exchange Agreement          
Schedule of Available-for-sale Securities [Line Items]          
Notes payable         $ 625
UKOG | UK Oil and Gas Investments | Subsidiary | Subsequent Event | Weald ATA, IoW ATA, and Settlement Agreement          
Schedule of Available-for-sale Securities [Line Items]          
Investment owned, value | £   £ 958 £ 703    
Central Petroleum          
Schedule of Available-for-sale Securities [Line Items]          
Impairment on AFS securities 14,900        
Other investment          
Schedule of Available-for-sale Securities [Line Items]          
Impairment on AFS securities $ 171