A. Basis of Presentation, Accounting Policies and Recent Accounting Pronouncements (Details) - USD ($)	Dec. 31, 2016	Jun. 30, 2016
Asset retirement obligation	$ 434,000	$ 434,000
Contingent land payment	682,000	672,700
Total	1,116,000	1,106,700
Level 1: Quoted Prices Quoted Prices in active Markets for Identical Assets [Member]
Asset retirement obligation		0
Contingent land payment		0
Total		0
Level 2: Significant Other Observable Inputs [Member]
Asset retirement obligation		0
Contingent land payment		0
Total		0
Level 3: Significant Unobservable Inputs [Member]
Asset retirement obligation	434,000	434,000
Contingent land payment	682,000	672,700
Total	$ 1,116,000	$ 1,106,700