SUPPLEMENTAL OIL AND GAS INFORMATION (UNAUDITED) - Costs Incurred (Details) - USD ($) $ in Thousands |
12 Months Ended | |
|---|---|---|
Jun. 30, 2016 |
Jun. 30, 2015 |
|
| Costs Incurred in Oil and Gas Activities | ||
| Exploration | $ 20 | $ 52 |
| Total costs incurred | 20 | 52 |
| Republic of Guinea | ||
| Costs Incurred in Oil and Gas Activities | ||
| Exploration | 20 | 52 |
| Total costs incurred | $ 20 | $ 52 |