Oil and Gas Reserve Data - Changes in Proved Reserves: (Details)	12 Months Ended
	Mar. 31, 2013 bbl	Mar. 31, 2012 bbl	Mar. 31, 2011 bbl	Mar. 31, 2010 bbl
Revision of previous estimates	(412,155)
Oil [Member]
Developed and Undeveloped Reserves	366,000	346,000	290,000	240,000
Revision of previous estimates	(10,000)	33,000	22,000
Purchase of minerals in place	48,000	19,000	45,000
Extensions and discoveries	5,000	23,000
Sales of minerals in place
Production	(23,000)	(19,000)	(17,000)
Natural Gas [Member]
Developed and Undeveloped Reserves	7,844,000	8,445,000	8,757,000	8,405,000
Revision of previous estimates	(589,000)	(183,000)	130,000
Purchase of minerals in place	71,000		545,000
Extensions and discoveries	318,000	267,000	136,000
Sales of minerals in place
Production	(401,000)	(396,000)	(459,000)