Condensed Consolidated Statements of Shareholders' Equity (Unaudited) - USD ($)	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Total
Balance (in shares) at Dec. 31, 2020	13,419,847
Balance at Dec. 31, 2020	$ 135,000	$ 409,000	$ 59,476,000	$ 60,020,000
Net income			3,719,000	3,719,000
Common stock repurchased and retired (in shares)	186,000
Common stock repurchased and retired	$ 2,000	817,000	1,547,000	2,366,000
Stock-based compensation expense		101,000		101,000
Options exercised (in shares)	89,494
Options exercised	$ 1,000	307,000		308,000
Common stock repurchased and retired (in shares)	(186,000)
Common stock repurchased and retired	$ (2,000)	(817,000)	(1,547,000)	(2,366,000)
Balance (in shares) at Mar. 31, 2021	13,323,341
Balance at Mar. 31, 2021	$ 134,000	0	61,648,000	61,782,000
Balance (in shares) at Dec. 31, 2020	13,419,847
Balance at Dec. 31, 2020	$ 135,000	409,000	59,476,000	60,020,000
Net income				6,156,000
Balance (in shares) at Sep. 30, 2021	13,162,341
Balance at Sep. 30, 2021	$ 132,000	0	62,596,000	62,728,000
Balance (in shares) at Mar. 31, 2021	13,323,341
Balance at Mar. 31, 2021	$ 134,000	0	61,648,000	61,782,000
Net income			1,671,000	1,671,000
Common stock repurchased and retired (in shares)	150,000
Common stock repurchased and retired	$ 2,000	151,000	1,189,000	1,342,000
Stock-based compensation expense		68,000		68,000
Options exercised (in shares)	35,000
Options exercised	$ 0	83,000		83,000
Common stock repurchased and retired (in shares)	(150,000)
Common stock repurchased and retired	$ (2,000)	(151,000)	(1,189,000)	(1,342,000)
Balance (in shares) at Jun. 30, 2021	13,208,341
Balance at Jun. 30, 2021	$ 132,000	0	62,130,000	62,262,000
Net income			766,000	766,000
Common stock repurchased and retired (in shares)	46,000
Common stock repurchased and retired	$ 0	69,000	300,000	369,000
Stock-based compensation expense		69,000		69,000
Common stock repurchased and retired (in shares)	(46,000)
Common stock repurchased and retired	$ 0	(69,000)	(300,000)	(369,000)
Balance (in shares) at Sep. 30, 2021	13,162,341
Balance at Sep. 30, 2021	$ 132,000	0	62,596,000	$ 62,728,000
Balance (in shares) at Dec. 31, 2021	13,115,341			13,115,341
Balance at Dec. 31, 2021	$ 132,000	0	62,488,000	$ 62,620,000	[1]
Net income			1,522,000	1,522,000
Common stock repurchased and retired (in shares)	170,000
Common stock repurchased and retired	$ 2,000	55,000	699,000	756,000
Stock-based compensation expense		55,000		55,000
Common stock repurchased and retired (in shares)	(170,000)
Common stock repurchased and retired	$ (2,000)	(55,000)	(699,000)	(756,000)
Balance (in shares) at Mar. 31, 2022	12,945,341
Balance at Mar. 31, 2022	$ 130,000	0	63,311,000	$ 63,441,000
Balance (in shares) at Dec. 31, 2021	13,115,341			13,115,341
Balance at Dec. 31, 2021	$ 132,000	0	62,488,000	$ 62,620,000	[1]
Net income				$ 2,718,000
Options exercised (in shares)				16,665
Balance (in shares) at Sep. 30, 2022	12,477,306			12,477,306
Balance at Sep. 30, 2022	$ 126,000	0	62,559,000	$ 62,685,000
Balance (in shares) at Mar. 31, 2022	12,945,341
Balance at Mar. 31, 2022	$ 130,000	0	63,311,000	63,441,000
Net income			693,000	693,000
Common stock repurchased and retired (in shares)	225,500
Common stock repurchased and retired	$ 2,000	62,000	896,000	960,000
Stock-based compensation expense		32,000		32,000
Options exercised (in shares)	8,332
Options exercised	$ 0	30,000		30,000
Common stock repurchased and retired (in shares)	(225,500)
Common stock repurchased and retired	$ (2,000)	(62,000)	(896,000)	(960,000)
Balance (in shares) at Jun. 30, 2022	12,728,173
Balance at Jun. 30, 2022	$ 128,000	0	63,108,000	63,236,000
Net income			503,000	503,000
Common stock repurchased and retired (in shares)	259,200
Common stock repurchased and retired	$ 2,000	62,000	1,052,000	1,116,000
Stock-based compensation expense		32,000		32,000
Options exercised (in shares)	8,333
Options exercised		30,000		30,000
Common stock repurchased and retired (in shares)	(259,200)
Common stock repurchased and retired	$ (2,000)	(62,000)	(1,052,000)	$ (1,116,000)
Balance (in shares) at Sep. 30, 2022	12,477,306			12,477,306
Balance at Sep. 30, 2022	$ 126,000	$ 0	$ 62,559,000	$ 62,685,000

[1] The condensed consolidated balance sheet as of December 31, 2021 has been prepared using information from the audited consolidated balance sheet as of that date.