Condensed Consolidated Statements of Shareholders' Equity (Unaudited) - USD ($)	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	AOCI Attributable to Parent [Member]	Total
Balance (in shares) at Dec. 31, 2021	13,115,341
Balance at Dec. 31, 2021	$ 132,000	$ 0	$ 62,488,000	$ (869,000)	$ 61,751,000
Net income			1,522,000	0	1,522,000
Common stock repurchased and retired (in shares)	(170,000)
Common stock repurchased and retired	$ (2,000)	(55,000)	(699,000)	0	(756,000)
Stock-based compensation expense		55,000		0	55,000
Total comprehensive income	$ 0	0	0	(153,000)	(153,000)
Common stock repurchased and retired		(55,000)		0	(55,000)
Balance (in shares) at Mar. 31, 2022	12,945,341
Balance at Mar. 31, 2022	$ 130,000	0	63,311,000	(1,022,000)	62,419,000
Balance (in shares) at Dec. 31, 2021	13,115,341
Balance at Dec. 31, 2021	$ 132,000	0	62,488,000	(869,000)	61,751,000
Net income					2,718,000
Balance (in shares) at Sep. 30, 2022	12,477,305
Balance at Sep. 30, 2022	$ 126,000	0	62,559,000	(1,424,000)	61,261,000
Balance (in shares) at Mar. 31, 2022	12,945,341
Balance at Mar. 31, 2022	$ 130,000	0	63,311,000	(1,022,000)	62,419,000
Net income			693,000	0	693,000
Common stock repurchased and retired (in shares)	(225,500)
Common stock repurchased and retired	$ (2,000)	(62,000)	(896,000)	0	(960,000)
Stock-based compensation expense		32,000		0	32,000
Options exercised (in shares)	8,332
Options exercised		30,000		0	30,000
Total comprehensive income	$ 0	0	0	(265,000)	(265,000)
Common stock repurchased and retired		(32,000)		0	(32,000)
Balance (in shares) at Jun. 30, 2022	12,728,173
Balance at Jun. 30, 2022	$ 128,000	0	63,108,000	(1,287,000)	61,949,000
Net income			503,000	0	503,000
Common stock repurchased and retired (in shares)	(259,200)
Common stock repurchased and retired	$ (2,000)	(62,000)	(1,052,000)	0	(1,116,000)
Stock-based compensation expense		32,000		0	32,000
Options exercised (in shares)	8,332
Options exercised		30,000		0	30,000
Total comprehensive income	$ 0	0	0	(137,000)	(137,000)
Common stock repurchased and retired		(32,000)		0	(32,000)
Balance (in shares) at Sep. 30, 2022	12,477,305
Balance at Sep. 30, 2022	$ 126,000	0	62,559,000	(1,424,000)	$ 61,261,000
Balance (in shares) at Dec. 31, 2022	12,226,306				12,226,306
Balance at Dec. 31, 2022	$ 123,000	0	62,124,000	(1,489,000)	$ 60,758,000	[1]
Net income			552,000	0	552,000
Common stock repurchased and retired (in shares)	(200,000)
Common stock repurchased and retired	$ (2,000)	(371,000)	(460,000)	0	(833,000)
Stock-based compensation expense		22,000		0	22,000
Options exercised (in shares)	109,250
Options exercised	$ 1,000		0	0	350,000
Total comprehensive income	$ 0	0	0	137,000	137,000
Common stock repurchased and retired		(22,000)		0	(22,000)
Balance (in shares) at Mar. 31, 2023	12,135,556
Balance at Mar. 31, 2023	$ 122,000	0	62,216,000	(1,352,000)	$ 60,986,000
Balance (in shares) at Dec. 31, 2022	12,226,306				12,226,306
Balance at Dec. 31, 2022	$ 123,000	0	62,124,000	(1,489,000)	$ 60,758,000	[1]
Net income					$ 3,128,000
Options exercised (in shares)					134,250
Balance (in shares) at Sep. 30, 2023	11,636,446				11,636,446
Balance at Sep. 30, 2023	$ 117,000	0	62,757,000	(1,483,000)	$ 61,391,000
Balance (in shares) at Mar. 31, 2023	12,135,556
Balance at Mar. 31, 2023	$ 122,000	0	62,216,000	(1,352,000)	60,986,000
Net income			1,146,000	0	1,146,000
Common stock repurchased and retired (in shares)	(275,000)
Common stock repurchased and retired	$ (3,000)	(65,000)	(1,029,000)		(1,097,000)
Stock-based compensation expense		22,000	0	(0)	22,000
Options exercised (in shares)	15,000
Options exercised		54,000		0	54,000
Total comprehensive income	$ 0	0	0	21,000	21,000
Common stock repurchased and retired		(22,000)	0	0	(22,000)
Treasury Stock Acquired, Purchase Price Significantly in Excess of Current Fair Value, Description		(11,000)			(11,000)
Balance (in shares) at Jun. 30, 2023	11,875,556
Balance at Jun. 30, 2023	$ 119,000	0	62,333,000	(1,331,000)	61,121,000
Net income			1,430,000	0	1,430,000
Common stock repurchased and retired (in shares)	(249,110)
Common stock repurchased and retired	$ (2,000)	(41,000)	(1,006,000)		(1,049,000)
Stock-based compensation expense		24,000	0	(0)	24,000
Options exercised (in shares)	10,000
Options exercised		36,000		0	36,000
Total comprehensive income	$ 0	0	0	(152,000)	(152,000)
Common stock repurchased and retired		(24,000)	0	0	(24,000)
Treasury Stock Acquired, Purchase Price Significantly in Excess of Current Fair Value, Description		(19,000)			$ (19,000)
Balance (in shares) at Sep. 30, 2023	11,636,446				11,636,446
Balance at Sep. 30, 2023	$ 117,000	$ 0	$ 62,757,000	$ (1,483,000)	$ 61,391,000

[1] The condensed consolidated balance sheet as of December 31, 2022, has been prepared using information from the audited consolidated balance sheet as of that date.