Consolidated Statements of Shareholders' Equity - 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				13,115,341
Balance at Dec. 31, 2021	$ 132,000	$ 18,131,000	$ 44,357,000	$ (869,000)	$ 61,751,000
Common stock repurchased and retired (in shares)	(170,000)
Common stock repurchased and retired	$ (2,000)	(235,000)	(519,000)	0	(756,000)
Stock-based compensation expense	0	55,000	0	0	55,000
Total comprehensive income	$ 0	0	0	(153,000)	(153,000)
Balance (in shares) at Mar. 31, 2022	12,945,341
Balance at Mar. 31, 2022	$ 130,000	17,951,000	45,360,000	(1,022,000)	$ 62,419,000
Balance (in shares) at Dec. 31, 2021	13,115,341				13,115,341
Balance at Dec. 31, 2021	$ 132,000	18,131,000	44,357,000	(869,000)	$ 61,751,000
Common stock repurchased and retired (in shares)	(910,700)				(910,700)
Common stock repurchased and retired	$ (9,000)	(1,259,000)	(2,614,000)	0	$ (3,882,000)
Options exercised (in shares)	21,665				21,665
Options exercised	$ 0	80,000	0	0	$ 80,000
Stock-based compensation expense	0	147,000	0	0	147,000
Total comprehensive income	$ 0	0	3,282,000	(620,000)	$ 2,662,000
Balance (in shares) at Dec. 31, 2022	12,226,306				12,226,306
Balance at Dec. 31, 2022	$ 123,000	17,099,000	45,025,000	(1,489,000)	$ 60,758,000
Balance (in shares) at Mar. 31, 2022	12,945,341
Balance at Mar. 31, 2022	$ 130,000	17,951,000	45,360,000	(1,022,000)	62,419,000
Common stock repurchased and retired (in shares)	(225,500)
Common stock repurchased and retired	$ (2,000)	(313,000)	(645,000)	0	(960,000)
Options exercised (in shares)	8,332
Options exercised	$ 0	30,000	0	0	30,000
Stock-based compensation expense	0	32,000	0	0	32,000
Total comprehensive income	$ 0	0	0	(265,000)	(265,000)
Balance (in shares) at Jun. 30, 2022	12,728,173
Balance at Jun. 30, 2022	$ 128,000	17,700,000	45,408,000	(1,287,000)	61,949,000
Common stock repurchased and retired (in shares)	(259,200)
Common stock repurchased and retired	$ (2,000)	(360,000)	(754,000)	0	(1,116,000)
Options exercised (in shares)	8,332
Options exercised	$ 0	30,000	0	0	30,000
Stock-based compensation expense	0	32,000	0	0	32,000
Total comprehensive income	$ 0	0	0	(137,000)	(137,000)
Balance (in shares) at Sep. 30, 2022	12,477,305
Balance at Sep. 30, 2022	$ 126,000	17,402,000	45,157,000	(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	17,099,000	45,025,000	(1,489,000)	$ 60,758,000
Common stock repurchased and retired (in shares)	(200,000)
Common stock repurchased and retired	$ (2,000)	(280,000)	(551,000)	0	(833,000)
Options exercised (in shares)	109,250
Options exercised	$ 1,000	349,000	0	0	350,000
Stock-based compensation expense	0	22,000	0	0	22,000
Total comprehensive income	$ 0	0	0	137,000	137,000
Balance (in shares) at Mar. 31, 2023	12,135,556
Balance at Mar. 31, 2023	$ 122,000	17,190,000	45,026,000	(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	17,099,000	45,025,000	(1,489,000)	$ 60,758,000
Common stock repurchased and retired (in shares)	(951,010)				(951,010)
Common stock repurchased and retired	$ (10,000)	(1,330,000)	(2,662,000)		$ (4,002,000)
Options exercised (in shares)	140,916				140,916
Options exercised		463,000		0	$ 464,000
Stock-based compensation expense		170,000	0	0	170,000
Total comprehensive income	$ 0	0	4,189,000	52,000	4,241,000
Cancellation of stock options (in shares)	0
Cancellation of stock options	$ 0	(23,000)	0	0	(23,000)
Treasury stock excise tax		(40,000)			$ (40,000)
Balance (in shares) at Dec. 31, 2023	11,416,212				11,416,212
Balance at Dec. 31, 2023	$ 114,000	16,339,000	46,552,000	(1,437,000)	$ 61,568,000
Balance (in shares) at Mar. 31, 2023	12,135,556
Balance at Mar. 31, 2023	$ 122,000	17,190,000	45,026,000	(1,352,000)	60,986,000
Common stock repurchased and retired (in shares)	(275,000)
Common stock repurchased and retired	$ (3,000)	(390,000)	(704,000)	0	(1,097,000)
Options exercised (in shares)	15,000
Options exercised	$ 0	54,000	0	0	54,000
Stock-based compensation expense	0	22,000	0	0	22,000
Total comprehensive income	0	0	0	21,000	21,000
Treasury stock excise tax	$ 0	(11,000)	0	0	(11,000)
Balance (in shares) at Jun. 30, 2023	11,875,556
Balance at Jun. 30, 2023	$ 119,000	16,865,000	45,468,000	(1,331,000)	61,121,000
Common stock repurchased and retired (in shares)	(249,110)
Common stock repurchased and retired	$ (2,000)	(354,000)	(693,000)	0	(1,049,000)
Options exercised (in shares)	10,000
Options exercised	$ 0	36,000	0	0	36,000
Stock-based compensation expense	0	24,000	0	0	24,000
Total comprehensive income	0	0	0	(152,000)	(152,000)
Treasury stock excise tax	$ 0	(19,000)	0	0	(19,000)
Balance (in shares) at Sep. 30, 2023	11,636,446
Balance at Sep. 30, 2023	$ 117,000	$ 16,552,000	$ 46,205,000	$ (1,483,000)	$ 61,391,000