Condensed Consolidated Statements of Income and Shareholders' Equity	USD ($) $ / shares
Income Statement [Abstract]
Leasing revenue	$ 2,615,000
Expenses:
Operating	539,000
General and administrative	665,000
Total expenses	1,204,000
Income from operations before income taxes	1,411,000
Income tax expense (benefit):
Current	462,000
Deferred	(75,000)
Total Income tax expense	387,000
Income from continuing operations	1,024,000
Loss on sale of discontinued operations, net of tax (Note 9)	(51,000)
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
Basic income (loss) per common share based upon 6,599,912 shares outstanding
Continuing operations | $ / shares	$ 0.15
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	273,000
Total expenses	559,000
Income from operations before income taxes	893,000
Current	282,000
Deferred	(43,000)
Total Income tax expense	239,000
Income from continuing operations	654,000
Loss on sale of discontinued operations, net of tax (Note 9)	(51,000)
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
Basic income (loss) per common share based upon 6,599,912 shares outstanding
Continuing operations | $ / shares	$ 0.09
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
Class A common stock	66,000
Capital in excess of par	782,000
Shareholders' equity, ending	7,112,000
Leasing revenue	2,743,000
Operating	432,000
General and administrative	675,000
Total expenses	1,107,000
Income from operations before income taxes	1,636,000
Current	514,000
Deferred	(70,000)
Total Income tax expense	444,000
Income from continuing operations	1,192,000
Loss on sale of discontinued operations, net of tax (Note 9)	(20,000)
Net income	1,172,000
Retained earnings, beginning at Dec. 31, 2022	6,264,000
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, 2023	$ 6,512,000
Basic income (loss) per common share based upon 6,599,912 shares outstanding
Continuing operations | $ / shares	$ 0.18
Basic income per common share based upon 6,599,912 shares outstanding | $ / shares	$ 0.18
Leasing revenue	$ 1,492,000
Operating	207,000
General and administrative	323,000
Total expenses	530,000
Income from operations before income taxes	962,000
Current	302,000
Deferred	(47,000)
Total Income tax expense	255,000
Income from continuing operations	707,000
Loss on sale of discontinued operations, net of tax (Note 9)	(20,000)
Net income	687,000
Retained earnings, beginning at Mar. 31, 2023	6,287,000
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, 2023	$ 6,512,000
Basic income (loss) per common share based upon 6,599,912 shares outstanding
Continuing operations | $ / shares	$ 0.1
Basic income per common share based upon 6,599,912 shares outstanding | $ / shares	$ 0.1
Class A common stock	$ 66,000
Capital in excess of par	782,000
Shareholders' equity, ending	$ 7,360,000