UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Preferred Stock [Member]	Common Stock [Member]	Treasury Stock [Member]	AOCI Attributable to Parent [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Total
Beginning balance, value at Dec. 31, 2019	$ 1,843	$ 136	$ (362)	$ (43)	$ 56,759	$ (54,777)	$ 3,556
Shares, Outstanding, Beginning Balance at Dec. 31, 2019	949,377	13,552,236	10,000
Conversion of preferred stock to common	$ (96)	$ 1			95
Preferred stock dividends declared, net of waived penalties by shareholders					33		33
Share-based compensation expense					19		19
Exercise of stock options		$ 1			74		75
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period		172,600
Net loss						(465)	(465)
Ending balance, value at Mar. 31, 2020	$ 1,747	$ 138	$ (362)	(43)	56,914	(55,242)	3,152
Shares, Outstanding, Ending Balance at Mar. 31, 2020	886,183	13,788,030	10,000
Stock Issued During Period, Shares, Conversion of Convertible Securities	(63,194)	63,194
Preferred stock dividends declared, net of waived penalties by shareholders					(33)		(33)
Beginning balance, value at Dec. 31, 2019	$ 1,843	$ 136	$ (362)	(43)	56,759	(54,777)	3,556
Shares, Outstanding, Beginning Balance at Dec. 31, 2019	949,377	13,552,236	10,000
Net loss							(2,590)
Ending balance, value at Sep. 30, 2020		$ 149	$ (362)	(43)	58,877	(57,367)	1,254
Shares, Outstanding, Ending Balance at Sep. 30, 2020		14,939,279	10,000
Beginning balance, value at Mar. 31, 2020	$ 1,747	$ 138	$ (362)	(43)	56,914	(55,242)	3,152
Shares, Outstanding, Beginning Balance at Mar. 31, 2020	886,183	13,788,030	10,000
Share-based compensation expense					55		55
Exercise of stock options					10		10
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period		14,000
Net loss						(715)	(715)
Dividends accrued					(33)		(33)
Ending balance, value at Jun. 30, 2020	$ 1,747	$ 138	$ (362)	(43)	56,946	(55,957)	2,469
Shares, Outstanding, Ending Balance at Jun. 30, 2020	886,183	13,802,030	10,000
Conversion of preferred stock to common	$ (1,747)	$ 10			1,738
Share-based compensation expense					100		100
Exercise of stock options		$ 1			106		107
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period		133,000
Net loss						(1,409)	(1,409)
Dividends accrued					(13)		(13)
Ending balance, value at Sep. 30, 2020		$ 149	$ (362)	(43)	58,877	(57,367)	1,254
Shares, Outstanding, Ending Balance at Sep. 30, 2020		14,939,279	10,000
Stock Issued During Period, Shares, Conversion of Convertible Securities	(886,183)	1,004,249
Beginning balance, value at Dec. 31, 2020		$ 174	$ (362)	(43)	77,187	(61,295)	15,661
Shares, Outstanding, Beginning Balance at Dec. 31, 2020		17,427,779	10,000
Conversion of preferred stock to common
Preferred stock dividends declared, net of waived penalties by shareholders
Share-based compensation expense					204		204
Exercise of stock options		$ 2			159		161
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period		197,227
Net loss						(3,903)	(3,903)
Ending balance, value at Mar. 31, 2021		$ 176	$ (362)	(43)	77,550	(65,198)	12,123
Shares, Outstanding, Ending Balance at Mar. 31, 2021		17,625,006	10,000
Preferred stock dividends declared, net of waived penalties by shareholders
Beginning balance, value at Dec. 31, 2020		$ 174	$ (362)	(43)	77,187	(61,295)	$ 15,661
Shares, Outstanding, Beginning Balance at Dec. 31, 2020		17,427,779	10,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period							256,727
Net loss							$ (14,951)
Ending balance, value at Sep. 30, 2021		$ 188	$ (362)	(43)	83,240	(76,246)	6,777
Shares, Outstanding, Ending Balance at Sep. 30, 2021		18,803,046	10,000
Beginning balance, value at Mar. 31, 2021		$ 176	$ (362)	(43)	77,550	(65,198)	12,123
Shares, Outstanding, Beginning Balance at Mar. 31, 2021		17,625,006	10,000
Share-based compensation expense					806		806
Exercise of stock options					7		7
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period		6,000
Net loss						(4,951)	(4,951)
Dividends accrued
Ending balance, value at Jun. 30, 2021		$ 176	$ (362)	(43)	78,363	(70,149)	7,985
Shares, Outstanding, Ending Balance at Jun. 30, 2021		17,631,006	10,000
Conversion of preferred stock to common
Share-based compensation expense					62		62
Exercise of stock options		$ 1			75		76
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period		53,500
Net loss						(6,097)	(6,097)
Dividends accrued
Public offering, net of fees		$ 11			4,740		4,751
Stock Issued During Period, Shares, New Issues		1,118,540
Ending balance, value at Sep. 30, 2021		$ 188	$ (362)	$ (43)	$ 83,240	$ (76,246)	$ 6,777
Shares, Outstanding, Ending Balance at Sep. 30, 2021		18,803,046	10,000