Oil and Gas Reserve Data (Unaudited) - Schedule of Standardized Measure of Discounted Future Net Cash Flows Relating to Proved Reserves (Details) - USD ($)	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2017
Extractive Industries [Abstract]
Future cash inflows	$ 70,766,000	$ 77,221,000
Future production costs and taxes	(19,355,000)	(20,080,000)
Future development costs	(9,424,000)	(12,009,000)
Future income taxes	(5,767,000)	(6,413,000)
Future net cash flows	36,220,000	38,719,000
Annual 10% discount for estimated timing of cash flows	(16,968,000)	(19,843,000)
Standardized measure of discounted future net cash flows	$ 19,252,000	$ 18,876,000	$ 19,083,000