Condensed Balance Sheets (Parenthetical) (USD $)	Mar. 31, 2012	Dec. 31, 2011
Condensed Balance Sheets
Proved properties, accumulated depletion	$ 12,803,691	$ 12,745,522

This element represents the cumulative amount of depletion of proved properties.

No definition available.

Name:	rgeb_ProvedPropertiesAccumulatedDepletion
Namespace Prefix:	rgeb_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant