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	$ 0	0	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	$ 0	101,000	0	101,000
Options exercised (in shares)	89,494
Options exercised	$ 1,000	307,000	0	308,000
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				5,390,000
Balance (in shares) at Jun. 30, 2021	13,208,341
Balance at Jun. 30, 2021	$ 132,000	0	62,130,000	62,262,000
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	$ 0	0	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	$ 0	68,000	0	68,000
Options exercised (in shares)	35,000
Options exercised	$ 0	83,000	0	83,000
Balance (in shares) at Jun. 30, 2021	13,208,341
Balance at Jun. 30, 2021	$ 132,000	0	62,130,000	$ 62,262,000
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	$ 0	0	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	$ 0	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	$ 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				$ 2,215,000
Options exercised (in shares)				8,332
Balance (in shares) at Jun. 30, 2022	12,728,173			12,728,173
Balance at Jun. 30, 2022	$ 128,000	0	63,108,000	$ 63,236,000
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	$ 0	0	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	$ 0	32,000	0	32,000
Options exercised (in shares)	8,332
Options exercised	$ 0	30,000	0	$ 30,000
Balance (in shares) at Jun. 30, 2022	12,728,173			12,728,173
Balance at Jun. 30, 2022	$ 128,000	$ 0	$ 63,108,000	$ 63,236,000

[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.