CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Cash flows from operating activities
Net income (loss)	$ 411,247	$ (356,424)
Adjustments to reconcile net income (loss) to net cash provided by operating activities
Depreciation and amortization	405,615	515,937
Unrealized (gain) loss on marketable equity securities	(214,736)	190,405
Amortization of loan procurement costs	49,784	50,047
Stock-based compensation	31,706	29,162
Changes in operating assets and liabilities:
Accounts receivable	28,002	55,423
Prepaid expenses and other assets	(90,132)	(84,099)
Accounts payable and accrued expenses	54,332	224,911
Net cash provided by operating activities	675,818	625,362
Cash flows from investing activities
Construction		(746,487)
Improvements and equipment additions	(42,035)	(53,643)
Net cash used in investing activities	(42,035)	(800,130)
Cash flows from financing activities
Principal payments on note payable	(126,015)	(120,850)
Dividends paid	(607,177)	(605,492)
Net cash used in financing activities	(733,192)	(726,342)
Net decrease in cash, cash equivalents, and restricted cash	(99,409)	(901,110)
Cash, cash equivalents, and restricted cash, beginning of period	1,955,443	4,263,565
Cash, cash equivalents, and restricted cash, end of period	1,856,034	3,362,455
Supplemental cash flow and noncash information
Cash paid for interest	237,477	267,132
Supplemental disclosure of noncash activities:
Dividends payable	$ 126	$ 1,795