CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Preferred Stock [Member]	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Total
Beginning balance at Dec. 31, 2021		$ 489	$ 104,423	$ (97,447)	$ 7,465
Beginning balance (in shares) at Dec. 31, 2021		48,893,573
Issuances of shares and stock option exercises		$ 4	178		182
Issuances of shares and stock option exercises (in shares)		427,107
Stock-based compensation			625		625
Net loss				(2,623)	(2,623)
Ending balance at Dec. 31, 2022		$ 493	105,226	(100,070)	5,649
Ending balance (in shares) at Dec. 31, 2022		49,320,680
Cumulative effect of accounting changes related to expected credit losses				(203)	(203)
Issuances of shares and stock option exercises		$ 3	151		154
Issuances of shares and stock option exercises (in shares)		306,574
Stock-based compensation			773		773
Rights offering expense			(81)		(81)
Net loss				(4,390)	(4,390)
Ending balance at Dec. 31, 2023		$ 496	$ 106,069	$ (104,663)	$ 1,902
Ending balance (in shares) at Dec. 31, 2023		49,627,254