Condensed Consolidated Statements of Income and Shareholders' Equity	USD ($) $ / shares
Income Statement [Abstract]
Leasing revenue	$ 3,661,000
Expenses:
Operating	601,000
General and administrative	1,048,000
Total expenses	1,649,000
Income from operations before income taxes	2,012,000
Income tax expense (benefit):
Current	595,000
Deferred	(38,000)
Total Income tax expense	557,000
Net income	1,455,000
Retained earnings, beginning at Dec. 31, 2020	6,334,000
Income tax expense (benefit):
Dividends on common stock ($.07 per share) based upon 6,599,912 shares outstanding	(1,386,000)
Retained earnings, ending at Sep. 30, 2021	$ 6,403,000
Income tax expense (benefit):
Basic income per common share based upon 6,599,912 shares outstanding | $ / shares	$ 0.22
Leasing revenue	$ 1,397,000
Operating	274,000
General and administrative	324,000
Total expenses	598,000
Income from operations before income taxes	799,000
Current	194,000
Deferred	28,000
Total Income tax expense	222,000
Net income	577,000
Retained earnings, beginning at Jun. 30, 2021	6,288,000
Income tax expense (benefit):
Dividends on common stock ($.07 per share) based upon 6,599,912 shares outstanding	(462,000)
Retained earnings, ending at Sep. 30, 2021	$ 6,403,000
Income tax expense (benefit):
Basic income per common share based upon 6,599,912 shares outstanding | $ / shares	$ 0.09
Class A common stock	$ 66,000
Capital in excess of par	782,000
Shareholders' equity, ending	7,251,000
Class A common stock	66,000
Capital in excess of par	782,000
Shareholders' equity, ending	7,173,000
Leasing revenue	3,821,000
Operating	821,000
General and administrative	1,121,000
Total expenses	1,942,000
Income from operations before income taxes	1,879,000
Current	610,000
Deferred	(94,000)
Total Income tax expense	516,000
Net income	1,363,000
Retained earnings, beginning at Dec. 31, 2021	6,325,000
Income tax expense (benefit):
Dividends on common stock ($.07 per share) based upon 6,599,912 shares outstanding	(1,386,000)
Retained earnings, ending at Sep. 30, 2022	$ 6,302,000
Income tax expense (benefit):
Basic income per common share based upon 6,599,912 shares outstanding | $ / shares	$ 0.21
Leasing revenue	$ 1,206,000
Operating	282,000
General and administrative	386,000
Total expenses	668,000
Income from operations before income taxes	538,000
Current	167,000
Deferred	(19,000)
Total Income tax expense	148,000
Net income	390,000
Retained earnings, beginning at Jun. 30, 2022	6,374,000
Income tax expense (benefit):
Dividends on common stock ($.07 per share) based upon 6,599,912 shares outstanding	(462,000)
Retained earnings, ending at Sep. 30, 2022	$ 6,302,000
Income tax expense (benefit):
Basic income per common share based upon 6,599,912 shares outstanding | $ / shares	$ 0.06
Class A common stock	$ 66,000
Capital in excess of par	782,000
Shareholders' equity, ending	$ 7,150,000