A. Basis of Presentation, Accounting Policies and Recent Accounting Pronouncements (Details) - USD ($) |
Mar. 31, 2017 |
Jun. 30, 2016 |
|---|---|---|
| Asset retirement obligation | $ 434,000 | $ 434,000 |
| Contingent land payment | 686,700 | 672,700 |
| Total | 1,120,700 | 1,106,700 |
| Level 1: Quoted Prices Quoted Prices in active Markets for Identical Assets [Member] | ||
| Asset retirement obligation | 0 | 0 |
| Contingent land payment | 0 | 0 |
| Total | 0 | 0 |
| Level 2: Significant Other Observable Inputs [Member] | ||
| Asset retirement obligation | 0 | 0 |
| Contingent land payment | 0 | 0 |
| Total | 0 | 0 |
| Level 3: Significant Unobservable Inputs [Member] | ||
| Asset retirement obligation | 434,000 | 434,000 |
| Contingent land payment | 686,700 | 672,700 |
| Total | $ 1,120,700 | $ 1,106,700 |