Statements of Cash Flows - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$ 1,115,060	$ 522,863
Less non-cash expenses included in net income:
Depreciation, depletion and amortization expense	3,885	16,852
Deferred income tax expense		(111,255)
Gain on sale of land	(881,654)	(34,711)
Changes in operating assets and liabilities:
Increase (decrease) in current assets	7,968	(77,551)
Increase (decrease) in current liabilities	(3,697)	88,055
Net cash provided by operating activities	241,562	404,253
CASH FLOWS FROM INVESTING ACTIVITIES
Purchases of certificates of deposit	(3,145,000)	(3,132,890)
Proceeds from maturity of certificates of deposit	2,662,890	3,610,000
Purchases of mutual funds	(244,825)
Purchases of fixed assets	(55,438)	(155,285)
Proceeds from the sale of fixed assets	982,242	39,388
Net cash provided by investing activities	199,869	361,213
CASH FLOWS FROM FINANCING ACTIVITIES
Dividends paid	(233,099)	(194,250)
Net cash used in financing activities	(233,099)	(194,250)
NET INCREASE IN CASH AND RESTRICTED CASH	208,332	571,216
Cash and restricted cash, beginning of the period	1,652,404	1,081,188
Cash and restricted cash, end of the period	1,860,736	1,652,404
SUPPLEMENTAL CASH FLOW INFORMATION
Cash paid for interest
Cash paid for income taxes	$ 355,387	$ 169,500