Condensed Consolidated Statements of Income and Shareholders' Equity	USD ($) $ / shares
Income Statement [Abstract]
Revenue	$ 3,821,000
Expenses:
Operating	821,000
General and administrative	976,000
Total expenses	1,797,000
Income from operations before income taxes	2,024,000
Income tax expense (benefit):
Current	649,000
Deferred	(94,000)
Total Income tax expense	555,000
Income from continuing operations	1,469,000
Loss on sale of discontinued operations, net of tax (Note 8)	(106,000)
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
Basic income (loss) per common share based upon 6,599,912 shares outstanding
Continuing operations | $ / shares	$ 0.22
Discontinued operations | $ / shares	(0.01)
Basic income per common share based upon 6,599,912 shares outstanding | $ / shares	$ 0.21
Revenue	$ 1,206,000
Operating	282,000
General and administrative	311,000
Total expenses	593,000
Income from operations before income taxes	613,000
Current	187,000
Deferred	(19,000)
Total Income tax expense	168,000
Income from continuing operations	445,000
Loss on sale of discontinued operations, net of tax (Note 8)	(55,000)
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
Basic income (loss) per common share based upon 6,599,912 shares outstanding
Continuing operations | $ / shares	$ 0.07
Discontinued operations | $ / shares	(0.01)
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
Class A common stock	66,000
Capital in excess of par	782,000
Shareholders' equity, ending	7,112,000
Revenue	4,056,000
Operating	659,000
General and administrative	1,007,000
Total expenses	1,666,000
Income from operations before income taxes	2,390,000
Current	732,000
Deferred	(70,000)
Total Income tax expense	662,000
Income from continuing operations	1,728,000
Loss on sale of discontinued operations, net of tax (Note 8)	(22,000)
Net income	1,706,000
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	(1,386,000)
Retained earnings, ending at Sep. 30, 2023	$ 6,584,000
Basic income (loss) per common share based upon 6,599,912 shares outstanding
Continuing operations | $ / shares	$ 0.26
Discontinued operations | $ / shares	(0)
Basic income per common share based upon 6,599,912 shares outstanding | $ / shares	$ 0.26
Revenue	$ 1,313,000
Operating	227,000
General and administrative	332,000
Total expenses	559,000
Income from operations before income taxes	754,000
Current	218,000
Total Income tax expense	218,000
Income from continuing operations	536,000
Loss on sale of discontinued operations, net of tax (Note 8)	(2,000)
Net income	534,000
Retained earnings, beginning at Jun. 30, 2023	6,512,000
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, 2023	$ 6,584,000
Basic income (loss) per common share based upon 6,599,912 shares outstanding
Continuing operations | $ / shares	$ 0.08
Discontinued operations | $ / shares	(0)
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	$ 7,432,000