Oil and Gas Reserve Data - Changes in Proved Reserves: (Details)	12 Months Ended
	Mar. 31, 2014 bbl	Mar. 31, 2013 bbl	Mar. 31, 2012 bbl	Mar. 31, 2011 bbl
Revision of previous estimates	(982,517)
Oil [Member]
Developed and Undeveloped Reserves	502,000	366,000	346,000	290,000
Revision of previous estimates	12,000	(10,000)	33,000
Purchase of minerals in place	50,000	48,000	19,000
Extensions and discoveries	101,000	5,000	23,000
Sales of minerals in place
Production	(27,000)	(23,000)	(19,000)
Natural Gas [Member]
Developed and Undeveloped Reserves	6,259,000	7,844,000	8,445,000	8,757,000
Revision of previous estimates	1,404,000	(589,000)	(183,000)
Purchase of minerals in place	18,000	71,000
Extensions and discoveries	163,000	318,000	267,000
Sales of minerals in place
Production	(362,000)	(401,000)	(396,000)