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16. Oil and Gas Reserve Data - Changes in Proved Reserves: (Details)	12 Months Ended
	Mar. 31, 2015 bbl Mcf	Mar. 31, 2014 bbl Mcf	Mar. 31, 2013 bbl Mcf	Mar. 31, 2012 bbl Mcf
Revision of previous estimates	(943,113)
Oil [Member]
Developed and Undeveloped Reserves | bbl	660,000	502,000	366,000	346,000
Revision of previous estimates | bbl	(90,000)	12,000	(10,000)
Purchase of minerals in place | bbl	43,000	50,000	48,000
Extensions and discoveries | bbl	235,000	101,000	5,000
Sales of minerals in place | bbl
Production | bbl	(30,000)	(27,000)	(23,000)
Natural Gas [Member]
Developed and Undeveloped Reserves	6,289,000	6,259,000	7,844,000	8,445,000
Revision of previous estimates	(665,000)	(1,404,000)	(589,000)
Purchase of minerals in place	795,000	18,000	71,000
Extensions and discoveries	269,000	163,000	318,000
Sales of minerals in place
Production	(369,000)	(362,000)	(401,000)

X

- Definition

Additions to proved reserves that result from (1) extension of the proved acreage of previously discovered (old) reservoirs through additional drilling in periods after discovery and (2) discovery of new fields with proved reserves or of new reservoirs of proved reserves in old fields.

+ References

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-Name Accounting Standards Codification



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- Definition

The net quantity of proved reserves as of the balance sheet date. Proved oil reserves are the estimated quantities of crude oil and natural gas liquids which geological and engineering data demonstrate with reasonable certainty to be recoverable.

+ References

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Production of proved reserves.

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Purchase of minerals in place.

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Revisions represent changes in previous estimates of proved reserves, either upward or downward, resulting from new information (except for an increase in proved acreage) normally obtained from development drilling and production history or resulting from change in economic factors.

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Sales of minerals in place.

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