Condensed Statements Of Changes In Stockholders' Equity - USD ($) $ in Thousands	Total	Common Stock Issued [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income [Member]
Beginning Balance at Dec. 31, 2019	$ 12,891	$ 339	$ 2,030	$ 10,522	$ 0
Beginning Balance, Shares at Dec. 31, 2019		3,395,521
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation expense	5		5
Net income (loss)	(119)			(119)
Ending Balance at Sep. 30, 2020	12,777	$ 339	2,035	10,403	0
Ending Balance, Shares at Sep. 30, 2020		3,395,521
Beginning Balance at Jun. 30, 2020	12,822	$ 339	2,034	10,449	0
Beginning Balance, Shares at Jun. 30, 2020		3,395,521
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation expense	1		1
Net income (loss)	(46)			(46)
Ending Balance at Sep. 30, 2020	12,777	$ 339	2,035	10,403	0
Ending Balance, Shares at Sep. 30, 2020		3,395,521
Beginning Balance at Dec. 31, 2020	12,774	$ 339	2,036	10,398	1
Beginning Balance, Shares at Dec. 31, 2020		3,395,521
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Other comprehensive loss	1				1
Stock-based compensation expense	4		4
Net income (loss)	229			229
Ending Balance at Sep. 30, 2021	13,006	$ 339	2,040	10,627	0
Ending Balance, Shares at Sep. 30, 2021		3,395,521
Beginning Balance at Jun. 30, 2021	12,988	$ 339	2,039	10,610	0
Beginning Balance, Shares at Jun. 30, 2021		3,395,521
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation expense	1		1
Net income (loss)	17			17
Ending Balance at Sep. 30, 2021	$ 13,006	$ 339	$ 2,040	$ 10,627	$ 0
Ending Balance, Shares at Sep. 30, 2021		3,395,521