Consolidated Statements of Stockholder's Equity - USD ($) $ in Thousands	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings (Accumulated Deficit) [Member]	Treasury Stock [Member]
Balance at Dec. 31, 2019	$ 34,893	$ 50	$ 41,576	$ (6,153)	$ (580)
Balance (in shares) at Dec. 31, 2019		4,933,063
Net income	968			968
Exercise of stock options	85		85
Exercise of stock options (in shares)		20,329
Repurchase of shares exercised	$ (23)		(23)
Repurchase of shares exercised, (in shares)	0	(2,295)
Stock-based compensation	$ 790		790
Stock-based compensation (in shares)		57,382
At-the market stock sales	3,254	$ 3	3,251
At-the-market stock sales, (in shares)		263,725
Share-related issuance costs	(202)		(202)
Balance at Dec. 31, 2020	$ 39,765	$ 53	45,477	(5,185)	(580)
Balance (in shares) at Dec. 31, 2020	5,272,204	5,272,204
Net income	$ 14,638			14,638
Exercise of stock options	$ 178		178
Exercise of stock options (in shares)	33,050	33,050
Repurchase of shares exercised	$ (251)		(251)
Repurchase of shares exercised, (in shares)	0	(22,999)
Stock-based compensation	$ 413		413
Stock-based compensation (in shares)		26,718
Balance at Dec. 31, 2021	$ 54,743	$ 53	$ 45,817	$ 9,453	$ (580)
Balance (in shares) at Dec. 31, 2021	5,308,973	5,308,973