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	$ 32,098,000	$ 32,935,000
Common stock repurchased and retired (in shares)	(223,100)			(223,100)
Common stock repurchased and retired	$ (2,000)	(2,664,000)	0	$ (2,666,000)
Options exercised (in shares)	757,674			757,674
Options exercised	$ 8,000	1,990,000		$ 1,998,000
Share-based compensation expense	$ 0	375,000	0	375,000
Net income			26,888,000	$ 26,888,000
Balance as of December 31, 2020 (in shares) at Dec. 31, 2020	13,419,847			13,419,847
Balance at Dec. 31, 2020	$ 135,000		58,986,000	$ 59,530,000
Common stock repurchased and retired (in shares)	(439,000)			(439,000)
Common stock repurchased and retired	$ (4,000)	(1,150,000)	(3,254,000)	$ (4,408,000)
Options exercised (in shares)	134,494			134,494
Options exercised		426,000		$ 427,000
Share-based compensation expense	$ 0	$ 315,000	0	315,000
Net income			6,756,000	$ 6,756,000
Balance as of December 31, 2020 (in shares) at Dec. 31, 2021	13,115,341			13,115,341
Balance at Dec. 31, 2021	$ 132,000		$ 62,488,000	$ 62,620,000