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 Jun. 30, 2019	949,000	13,539,000	(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 Jun. 30, 2019	$ 1,843	$ 135		56,785	(56,536)		$ 1,822
Stock Issued During Period, Shares, Conversion of Convertible Securities (in shares)
Exercise of stock options (in shares)		280,000					280,500
Conversion of preferred stock to common
Exercise of stock options		$ 2		224
Balance, beginning of quarter and end of quarter (in shares)	949,000	13,539,000	(362,000)
Stock-based compensation				14
Preferred stock dividends declared, net of waived penalties by shareholders				(62)
Net income (loss)					2,706		$ 2,706
Balance, beginning of quarter and end of quarter (in shares)	949,000	13,539,000	(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 Jun. 30, 2020	886,000	13,802,000	(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 Jun. 30, 2020	$ 1,747	$ 138		56,946	(55,957)		$ 2,469
Stock Issued During Period, Shares, Conversion of Convertible Securities (in shares)		63,000
Exercise of stock options (in shares)		187,000					186,600
Conversion of preferred stock to common		$ 1		95
Exercise of stock options		$ 1		84
Balance, beginning of quarter and end of quarter (in shares)	886,000	13,802,000	(362,000)
Stock-based compensation				74
Preferred stock dividends declared, net of waived penalties by shareholders				$ (66)
Net income (loss)					$ (1,180)		$ (1,180)
Balance, beginning of quarter and end of quarter (in shares)	886,000	13,802,000	(362,000)