Oil and Gas Reserve Data (Unaudited) - Schedule of Changes in Standardized Measure of Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves (Details) - USD ($)	12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2015
Extractive Industries [Abstract]
Sales of oil and gas produced, net of production costs	$ (1,459,000)	$ (1,240,000)	$ (2,036,000)
Net changes in price and production costs	1,849,000	(12,510,000)	(4,066,000)
Changes in previously estimated development costs	970,000	3,701,000	2,627,000
Revisions of quantity estimates	(404,000)	(602,000)	(3,718,000)
Net change due to purchases and sales of minerals in place	(2,380,000)	(105,000)	2,777,000
Extensions and discoveries, less related costs	6,994,000	5,174,000	4,607,000
Net change in income taxes	(3,959,000)	2,539,000	654,000
Accretion of discount	1,612,000	2,370,000	2,474,000
Changes in timing of estimated cash flows and other	1,962,000	(4,367,000)	(3,710,000)
Changes in standardized measure	5,185,000	(5,040,000)	(391,000)
Standardized measure, beginning of year	13,898,000	18,938,000	19,329,000
Standardized measure, end of year	$ 19,083,000	$ 13,898,000	$ 18,938,000