Statements of Cash Flows - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Cash from Operating Activities:
Oil and Gas Sales	$ 7,790,371	$ 6,029,703
Lease Bonuses and Other	562,184	184,282
Sale of Equity Securities	1,514,362	3,483,394
Interest Received	315,146	119,265
Agricultural Rentals and Other	6,008	9,140
Dividends Received on Equity Securities	2,902	2,597
Cash Distributions from Equity Method Investments	24,750	49,500
Income Tax Refunds, Net of Income Taxes Paid	214,784	199,439
Cash Paid –
Production Costs	(2,391,711)	(2,195,844)
General Suppliers, Employees and Taxes, Other than Income Taxes	(1,674,759)	(1,623,453)
Purchase of Equity Securities	(1,517,352)	(3,486,002)
Farm Expense and Other	(585)	(569)
Net Cash Provided by Operating Activities	4,846,100	2,771,452
Cash Provided by/(Applied to) Investing Activities:
Maturity of Available-for-Sale Debt Securities	32,786,554	29,841,639
Purchase of Available-for-Sale Debt Securities	(32,664,425)	(32,769,546)
Proceeds from Disposal of Property, Plant and Equipment	587,408	150,948
Purchase of Property, Plant and Equipment	(2,788,038)	(2,688,759)
Cash Distributions from Other Investments	16,500	445,000
Purchase of Other Investments	(55,949)	(6,444)
Notes Receivable	(43,158)	(175,000)
Net Cash Applied to Investing Activities	(2,161,108)	(5,202,162)
Cash Applied to Financing Activities:
Dividends Paid to Stockholders	(959,499)	(837,505)
Purchase of Treasury Stock	(64,804)	(35,829)
Total Cash Applied to Financing Activities	(1,024,303)	(873,334)
Net Change in Cash and Cash Equivalents	1,660,689	(3,304,044)
Cash and Cash Equivalents at Beginning of Year	4,767,810	8,071,854
Cash and Cash Equivalents at End of Year	6,428,499	4,767,810
Reconciliation of Net Income to Net Cash Provided by Operating Activities:
Net Income	2,313,692	685,687
Net Income Increased (Decreased) by Net Change in –
Net Unrealized Holding (Gains)/Losses on Equity Securities	181,818	(48,738)
Accounts Receivable	25,057	(95,259)
Interest and Dividends Receivable	(33,469)	(11,233)
Refundable Income Taxes	310,443	209,968
Accounts Payable	4,692	(13,034)
Equity Securities	(75,940)	(37,491)
Deferred Taxes	292,221	(593,111)
Other Liabilities	(12,030)	46,228
(Income)/Loss from Equity Method and Other Investments	67,984	(383,024)
Cash Distributions from Equity Method Investments	24,750	49,500
Exploration Costs	205,671	838,145
Disposition of Property, Plant and Equipment	(562,671)	(9,524)
Depreciation, Depletion, Amortization and Valuation Provisions	2,103,882	2,133,338
Net Cash Provided by Operating Activities	$ 4,846,100	$ 2,771,452