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, 2019	12,885,273
Balance at Dec. 31, 2019	$ 129,000	$ 708,000	$ 32,390,000	$ 33,227,000
Net income			5,342,000	5,342,000
Common stock repurchased and retired (in shares)	(35,100)
Common stock repurchased and retired		(125,000)		(125,000)
Stock-based compensation expense		91,000		91,000
Options exercised (in shares)	712,839
Options exercised	$ 7,000	1,834,000		1,841,000
Balance (in shares) at Mar. 31, 2020	13,563,012
Balance at Mar. 31, 2020	$ 136,000	2,508,000	37,732,000	$ 40,376,000
Balance (in shares) at Dec. 31, 2020	13,419,847			13,419,847	[1]
Balance at Dec. 31, 2020	$ 135,000	409,000	59,476,000	$ 60,020,000	[2]
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			89,494
Options exercised	$ 1,000	307,000		$ 308,000
Balance (in shares) at Mar. 31, 2021	13,323,341			13,323,341
Balance at Mar. 31, 2021	$ 134,000		$ 61,648,000	$ 61,782,000

[1] The condensed consolidated balance sheet as of December 31, 2020 has been prepared using information from the audited consolidated balance sheet as of that date.

[2] The condensed consolidated balance sheet as of December 31, 2020 has been prepared using information from the audited consolidated balance sheet as of that date.