Condensed Consolidated Statements of Income and Shareholders' Equity	USD ($) $ / shares
Income Statement [Abstract]
Leasing revenue	$ 2,264,000
Expenses:
Operating	327,000
General and administrative	724,000
Total expenses	1,051,000
Income from operations before income taxes	1,213,000
Income tax expense (benefit):
Current	401,000
Deferred	(66,000)
Total Income tax expense	335,000
Net income	878,000
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	(924,000)
Retained earnings, ending at Jun. 30, 2021	$ 6,288,000
Income tax expense (benefit):
Basic income per common share based upon 6,599,912 shares outstanding | $ / shares	$ 0.13
Leasing revenue	$ 1,216,000
Operating	163,000
General and administrative	371,000
Total expenses	534,000
Income from operations before income taxes	682,000
Current	209,000
Deferred	(22,000)
Total Income tax expense	187,000
Net income	495,000
Retained earnings, beginning at Mar. 31, 2021	6,255,000
Income tax expense (benefit):
Dividends on common stock ($.07 per share) based upon 6,599,912 shares outstanding	(462,000)
Retained earnings, ending at Jun. 30, 2021	$ 6,288,000
Income tax expense (benefit):
Basic income per common share based upon 6,599,912 shares outstanding | $ / shares	$ 0.08
Class A common stock	$ 66,000
Capital in excess of par	782,000
Shareholders' equity, ending	7,136,000
Class A common stock	66,000
Capital in excess of par	782,000
Shareholders' equity, ending	7,173,000
Leasing revenue	2,615,000
Operating	539,000
General and administrative	735,000
Total expenses	1,274,000
Income from operations before income taxes	1,341,000
Current	443,000
Deferred	(75,000)
Total Income tax expense	368,000
Net income	973,000
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	(924,000)
Retained earnings, ending at Jun. 30, 2022	$ 6,374,000
Income tax expense (benefit):
Basic income per common share based upon 6,599,912 shares outstanding | $ / shares	$ 0.15
Leasing revenue	$ 1,452,000
Operating	286,000
General and administrative	343,000
Total expenses	629,000
Income from operations before income taxes	823,000
Current	263,000
Deferred	(43,000)
Total Income tax expense	220,000
Net income	603,000
Retained earnings, beginning at Mar. 31, 2022	6,233,000
Income tax expense (benefit):
Dividends on common stock ($.07 per share) based upon 6,599,912 shares outstanding	(462,000)
Retained earnings, ending at Jun. 30, 2022	$ 6,374,000
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	$ 7,222,000