Statements of Cash Flows (Unaudited) - USD ($)	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$ 105,721	$ 837,361
Less non-cash expenses included in net income:
Depreciation, depletion and amortization expense	616	8,735
Gain on sale of land	(75,926)	(878,320)
Unrealized gain on equity investment in mutual funds	(245)
Changes in operating assets and liabilities:
Increase (decrease) in current assets	(47,609)	(55,817)
Increase (decrease) in current liabilities	(22,567)	44,330
Net cash used in operating activities	(40,010)	(43,711)
CASH FLOWS FROM INVESTING ACTIVITIES
Purchases of certificates of deposit	(489,000)	(965,000)
Proceeds from maturity of certificates of deposit	710,000	980,000
Purchases of mutual funds	(1,458)
Purchases of fixed assets	(17,970)	(37,743)
Proceeds from the sale of fixed assets	104,235	993,160
Net cash provided by investing activities	305,807	970,417
NET INCREASE IN CASH AND RESTRICTED CASH	265,797	926,706
Cash and restricted cash, beginning of the period	1,860,736	1,652,404
Cash and restricted cash, end of the period	2,126,533	2,579,110
SUPPLEMENTAL CASH FLOW INFORMATION
Cash paid for interest
Cash paid for income taxes	$ 60,500	$ 183,000