Supplemental Reserve Information (Details 2) - USD ($)	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Standardized measure of discounted future net cash flows related to proved reserves:
Future production revenue	$ 22,235,000	$ 35,572,000	$ 33,992,000
Future development costs
Future production costs	(9,167,000)	(17,830,000)	(18,700,000)
Future net cash flow before Federal income taxes	13,068,000	17,742,000	15,292,000
Future income taxes	(1,960,000)	(2,661,000)	(3,211,000)
Future net cash flows	11,108,000	15,081,000	12,081,000
Effect of 10% annual discounting	(5,010,000)	(4,030,000)	(2,287,000)
Standardized measure of discounted cash flows	$ 6,098,000	$ 11,051,000	$ 9,794,000	$ 6,023,000