Condensed Consolidated Statements of Income and Shareholders' Equity	USD ($) $ / shares
Income Statement [Abstract]
Revenue	$ 2,743,000
Expenses:
Operating	432,000
General and administrative	675,000
Total expenses	1,107,000
Income from continuing operations before income taxes	1,636,000
Income tax expense:
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:
Dividends on common stock based on 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
Discontinued operations | $ / shares	(0)
Total basic income per common share | $ / shares	$ 0.18
Revenue	$ 1,492,000
Operating	207,000
General and administrative	323,000
Total expenses	530,000
Income from continuing 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:
Dividends on common stock based on 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
Discontinued operations | $ / shares	(0)
Total basic income per common share | $ / shares	$ 0.1
Class A common stock	$ 66,000
Capital in excess of par	782,000
Shareholders' equity, ending	7,360,000
Class A common stock	66,000
Capital in excess of par	782,000
Shareholders' equity, ending	7,591,000
Revenue	2,836,000
Operating	486,000
General and administrative	693,000
Total expenses	1,179,000
Income from continuing operations before income taxes	1,657,000
Current	493,000
Deferred	(42,000)
Total Income tax expense	451,000
Income from continuing operations	1,206,000
Loss on sale of discontinued operations, net of tax (Note 9)	(290,000)
Net income	916,000
Retained earnings, beginning at Dec. 31, 2023	6,743,000
Income tax expense:
Dividends on common stock based on 6,599,912 shares outstanding	(924,000)
Retained earnings, ending at Jun. 30, 2024	$ 6,735,000
Basic income (loss) per common share based upon 6,599,912 shares outstanding:
Continuing operations | $ / shares	$ 0.18
Discontinued operations | $ / shares	(0.04)
Total basic income per common share | $ / shares	$ 0.14
Revenue	$ 1,494,000
Operating	227,000
General and administrative	325,000
Total expenses	552,000
Income from continuing operations before income taxes	942,000
Current	305,000
Deferred	(26,000)
Total Income tax expense	279,000
Income from continuing operations	663,000
Loss on sale of discontinued operations, net of tax (Note 9)	(235,000)
Net income	428,000
Retained earnings, beginning at Mar. 31, 2024	6,769,000
Income tax expense:
Dividends on common stock based on 6,599,912 shares outstanding	(462,000)
Retained earnings, ending at Jun. 30, 2024	$ 6,735,000
Basic income (loss) per common share based upon 6,599,912 shares outstanding:
Continuing operations | $ / shares	$ 0.11
Discontinued operations | $ / shares	(0.04)
Total basic income per common share | $ / shares	$ 0.07
Class A common stock	$ 66,000
Capital in excess of par	782,000
Shareholders' equity, ending	$ 7,583,000