Oil and Gas Reserve Data (Unaudited) - Schedule of Changes in Standardized Measure of Discounted Future Net Cash Flows to Proved Oil and Gas Reserves (Details) - USD ($)	12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Oil And Gas Reserve Data Unaudited - Schedule Of Changes In Standardized Measure Of Discounted Future Net Cash Flows To Proved Oil And Gas Reserves
Sales of oil and gas produced, net of production costs	$ (1,580,000)	$ (1,459,000)
Net changes in price and production costs	6,967,000	1,849,000
Changes in previously estimated development costs	16,196,000	970,000
Revisions of quantity estimates	(23,969,000)	(404,000)
Net change due to purchases and sales of minerals in place	(1,744,000)	(2,380,000)
Extensions and discoveries, less related costs	1,240,000	6,994,000
Net change in income taxes	3,057,000	(3,959,000)
Accretion of discount	2,527,000	1,612,000
Changes in timing of estimated cash flows and other	(2,901,000)	1,962,000
Changes in standardized measure	(207,000)	5,185,000
Standardized measure, beginning of year	19,083,000	13,898,000
Standardized measure, end of year	$ 18,876,000	$ 19,083,000