Consolidated Statements of Stockholder's Equity - USD ($) $ in Thousands	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Accumulated Deficit [Member]	Treasury Stock [Member]	Accumulated Other Comprehensive Income (Loss) [Member]
Balance at Dec. 31, 2017	$ 24,928	$ 47	$ 40,035	$ (14,609)	$ (580)	$ 35
Balance (in shares) at Dec. 31, 2017		4,692,893
Net income	1,405			1,405
Cumulative effect adjustment from adoption of Accounting Standards Update | ASU 2016-01 [Member]				35		$ (35)
Exercise of stock options	27		27
Exercise of stock options (in shares)		9,376
Repurchase of shares exercised		(1,200)
Stock-based compensation	64		64
Stock-based compensation (in shares)		6,516
Warrant dividend exercise	927	$ 2	925
Warrant dividend exercise (in shares)		123,593
Issuance costs for rights offering	(28)		(28)
Balance at Dec. 31, 2018	$ 27,323	$ 49	41,023	(13,169)	(580)
Balance (in shares) at Dec. 31, 2018	4,831,178	4,831,178
Net income	$ 7,016			7,016
Exercise of stock options	$ 442	$ 1	441
Exercise of stock options (in shares)	96,748	96,748
Repurchase of shares exercised		(734)
Stock-based compensation	$ 112		112
Stock-based compensation (in shares)	5,871	5,871
Balance at Dec. 31, 2019	$ 34,893	$ 50	$ 41,576	$ (6,153)	$ (580)
Balance (in shares) at Dec. 31, 2019	4,933,063	4,933,063