Consolidated Statements of Income and Retained Earnings - USD ($)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Income Statement [Abstract]
Leasing revenue	$ 5,525,000	$ 5,075,000
Expenses:
Operating	882,000	922,000
General and administrative	1,394,000	1,337,000
Total expenses	2,276,000	2,259,000
Income from continuing operations before income taxes	3,249,000	2,816,000
Income tax expense:
Current	885,000	765,000
Deferred	13,000	9,000
Total Income tax expense	898,000	774,000
Income from continuing operations	2,351,000	2,042,000
Loss on sale of discontinued operations, net of tax (Note 9)	(24,000)	(255,000)
Net income	2,327,000	1,787,000
Retained earnings, beginning	6,264,000	6,325,000
Dividends on common stock based on 6,599,912 shares outstanding	(1,848,000)	(1,848,000)
Retained earnings, ending	$ 6,743,000	$ 6,264,000
Basic income (loss) per common share based upon 6,599,912 shares outstanding
Continuing operations	$ 0.35	$ 0.31
Discontinued operations	0	(0.04)
Total basic income per common share	$ 0.35	$ 0.27