Unaudited Condensed Consolidated Statements of Changes in Stockholders' Equity - USD ($) shares in Thousands, $ in Thousands	Preferred Stock	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Treasury Stock	Other Comprehensive Income / Loss	Total
Beginning balance, shares at Dec. 31, 2018	949	13,259
Beginning balance, value at Dec. 31, 2018	$ 1,843	$ 133	$ 56,609	$ (59,242)	$ (362)	$ (43)
Exercise of stock options, shares		291
Exercise of stock options, value		$ 2	234
Stock-based compensation			24
Preferred stock dividends declared, net of waived penalties by shareholders			(97)
Net income (loss)				4,169			$ 4,169
Ending balance, shares at Sep. 30, 2019	949	13,550
Ending balance, value at Sep. 30, 2019	$ 1,843	$ 135	56,770	(55,073)	(362)	(43)	3,270
Beginning balance, shares at Dec. 31, 2019	949	13,552
Beginning balance, value at Dec. 31, 2019	$ 1,843	$ 136	56,759	(54,777)	(362)	(43)	3,556
Conversion of preferred shares to common shares, shares converted	(949)	1,067
Conversion of preferred shares to common shares, value	$ (1,843)	$ 10	1,833
Exercise of stock options, shares		320
Exercise of stock options, value		$ 3	190
Stock-based compensation			174
Preferred stock dividends declared, net of waived penalties by shareholders			(79)
Net income (loss)				(2,590)			(2,590)
Ending balance, shares at Sep. 30, 2020	0	14,939
Ending balance, value at Sep. 30, 2020	$ 0	$ 149	$ 58,877	$ (57,367)	$ (362)	$ (43)	$ 1,254