Condensed Balance Sheets (Parenthetical) (USD $)	Mar. 31, 2013	Dec. 31, 2012
Condensed Balance Sheets
Proved properties, accumulated depletion	$ 12,907,538	$ 13,197,289

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