Oil and Gas Reserve Data - Changes in Standardized Measure of Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves: (Details) (USD $)	12 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2012
Extractive Industries [Abstract]
Sales of oil and gas produced, net of production costs	$ (2,762,000)	$ (1,982,000)	$ (2,298,000)
Net changes in price and production costs	2,464,000	(5,881,000)	(375,000)
Changes in previously estimated development costs	270,000	1,150,000	1,353,000
Revisions of quantity estimates	(657,000)	(811,000)	1,344,000
Net change due to purchases and sales of minerals in place	1,332,000	1,471,000	390,000
Extensions and discoveries, less related costs	3,802,000	321,000	1,449,000
Net change in income taxes	(1,997,000)	2,178,000	(596,000)
Accretion of discount	1,779,000	2,495,000	2,265,000
Changes in timing of estimated cash flows and other	729,000	(3,928,000)	(1,828,000)
Changes in standardized measure	4,960,000	(4,987,000)	1,704,000
Standardized measure, beginning of year	14,369,000	19,356,000	17,652,000
Standardized measure, end of year	$ 19,329,000	$ 14,369,000	$ 19,356,000