Unaudited Condensed Consolidated Statements of Changes In Stockholders' Equity - USD ($) $ in Thousands	Preferred Stock [Member]	Common Stock [Member]	Treasury Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	AOCI Attributable to Parent [Member]	Total
Balance, beginning of quarter and end of quarter (in shares)	949,000	13,259,000
Balance, beginning of quarter (in shares) at Dec. 31, 2018	949,000	13,259,000
Conversion of preferred stock to common (in shares)
Balance, end of quarter (in shares) at Mar. 31, 2019	949,000	13,525,000	(362,000)
Balance, beginning of quarter at Dec. 31, 2018	$ 1,843	$ 133		$ 56,609	$ (59,242)	$ (43)
Conversion of preferred stock to common
Balance, end of quarter at Mar. 31, 2019	$ 1,843	$ 135		56,803	(58,295)		$ 81
Conversion of preferred stock to common (in shares)
Exercise of stock options (in shares)		266,000					266,000
Conversion of preferred stock to common
Exercise of stock options		$ 2		218
Balance, beginning of quarter and end of quarter (in shares)	949,000	13,525,000	(362,000)
Stock-based compensation				4
Preferred stock dividends declared, net of waived penalties by shareholders				(28)
Net income (loss)					947		$ 947
Balance, beginning of quarter and end of quarter (in shares)	949,000	13,525,000	(362,000)
Balance, beginning of quarter and end of quarter (in shares)	949,000	13,552,000
Balance, beginning of quarter (in shares) at Dec. 31, 2019	949,000	13,552,000
Conversion of preferred stock to common (in shares)	(63,000)
Balance, end of quarter (in shares) at Mar. 31, 2020	886,000	13,788,000	(362,000)
Balance, beginning of quarter at Dec. 31, 2019	$ 1,843	$ 136		56,759	(54,777)	$ (43)	3,556
Conversion of preferred stock to common	(96)						(96)
Balance, end of quarter at Mar. 31, 2020	$ 1,747	$ 138		56,914	(55,242)		$ 3,152
Conversion of preferred stock to common (in shares)		63,000
Exercise of stock options (in shares)		173,000					172,600
Conversion of preferred stock to common		$ 1		95
Exercise of stock options		$ 1		74
Balance, beginning of quarter and end of quarter (in shares)	886,000	13,788,000	(362,000)
Stock-based compensation				19
Preferred stock dividends declared, net of waived penalties by shareholders				$ (33)
Net income (loss)					$ (465)		$ (465)
Balance, beginning of quarter and end of quarter (in shares)	886,000	13,788,000	(362,000)