Consolidated Statements of Cash Flows - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$ 4,440,963	$ 2,075,625
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, depletion and amortization	715,399	1,026,172
Accretion expense	313,641	355,127
Gain on disposal of property and equipment	(644,898)	(80,368)
Gain on sale of other assets	(15,164)	(175,612)
Deferred income taxes	3,000	(36,300)
Changes in assets and liabilities:
Production accounts receivable	(472,145)	(171,212)
Other current assets	(47,831)	25,606
Other assets	824	(13,740)
Accounts payable	(88,157)	254,601
Accrued expenses	12,903	(124,549)
Operational advances	621,708	460,342
Total adjustments	399,280	1,520,067
Net cash provided by operating activities	4,840,243	3,595,692
CASH FLOWS FROM INVESTING ACTIVITIES
Purchase of investments	(3,856,358)	(3,127,170)
Payments received on notes receivables from employees	46,870	52,203
Advances disbursed to employees	(3,700)	(11,900)
Purchase of property and equipment	(405,623)	(221,108)
Proceeds from disposal of property and equipment	40,381	128,281
Proceeds from sale of other assets	25,539	242,862
Net cash used in investing activities	(4,152,891)	(2,936,832)
CASH FLOWS FROM FINANCING ACTIVITIES
Repurchase of Units	(7,509)
Proceeds from options exercised	3,300
Net cash used in financing activities	(4,209)
NET CHANGE IN CASH AND EQUIVALENTS	683,143	658,860
CASH AND EQUIVALENTS AT BEGINNING OF YEAR	11,883,725	11,224,865
CASH AND EQUIVALENTS AT END OF YEAR	12,566,868	11,883,725
Supplemental disclosures of cash flow information:
Cash paid during the year for income taxes	$ 3,650	$ 5,499