Quarterly report pursuant to Section 13 or 15(d)

Securities Available-for-Sale (Details)

v3.6.0.2
Securities Available-for-Sale (Details) - USD ($)
$ in Thousands, shares in Millions
Dec. 31, 2016
Aug. 11, 2016
Jun. 30, 2016
Apr. 15, 2016
Schedule of Available-for-sale Securities [Line Items]        
Amortized cost $ 1,335   $ 885  
Gross unrealized gains 207   0  
Gross unrealized losses 0   (284)  
Fair value 1,542   601  
Notes payable $ 31   $ 783  
One Stone | Investor | One Stone Exchange Agreement        
Schedule of Available-for-sale Securities [Line Items]        
Notes payable       $ 625
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