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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
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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

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