Consolidated Statements of Stockholders' Equity - USD ($)	Common Stock Warrants [Member] Common Stock Outstanding [Member]	Common Stock Warrants [Member] Additional Paid-in Capital [Member]	Common Stock Warrants [Member]	Series F Preferred Warrants [Member] Preferred Stock [Member]	Series F Preferred Warrants [Member] Common Stock Outstanding [Member]	Series F Preferred Warrants [Member] Additional Paid-in Capital [Member]	Series F Preferred Warrants [Member]	Preferred Stock [Member]	Common Stock Outstanding [Member]	Treasury Stock, Common [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Total
Balance (in shares) at Dec. 31, 2022								0	208,047	189
Balance at Dec. 31, 2022								$ 0	$ 0	$ (181,000)	$ 227,646,000	$ (223,847,000)	$ 3,618,000
Net loss								$ 0	$ 0	$ 0	0	(4,384,000)	$ (4,384,000)
Issuances related to stock compensation (in shares)								0	4,490	0			4,490
Stock-based compensation								$ 0	$ 0	$ 0	504,000	0	$ 504,000
Issuance, preferred (in shares)								6,550	0	0
Proceeds from private placement, net of fees								$ 0	$ 0	$ 0	5,364,000	0	5,364,000
Proceeds from warrant exercise, net of fees (in shares)			8,490					0	8,490	0
Proceeds from warrant exercise, net of fees								$ 0	$ 0	$ 0	534,000	0	534,000
Common stock exchanged for pre-funded warrants (in shares)								0	(10,170)	0
Exercise of pre-funded warrants (in shares)								0	10,163	0
Conversions, preferred (in shares)								(4,620)
Conversions of Series F Preferred Stock and accrued dividends								$ 0	$ 0	$ 0	208,000	0	208,000
Issuances from Preferred Stock conversions (in shares)									352,624	0
Series F Preferred Stock dividends								$ 0	$ 0	$ 0	(343,000)	0	(343,000)
Balance (in shares) at Dec. 31, 2023								1,930	573,644	189
Balance at Dec. 31, 2023								$ 0	$ 0	$ (181,000)	233,913,000	(228,231,000)	5,501,000
Net loss								$ 0	$ 0	$ 0	0	(4,043,000)	(4,043,000)
Issuances related to stock compensation (in shares)								0	0	0
Stock-based compensation								$ 0	$ 0	$ 0	62,000	0	62,000
Proceeds from warrant exercise, net of fees (in shares)	282,314		282,314	1,648	0
Proceeds from warrant exercise, net of fees		$ 903,000	$ 903,000			$ 1,478,000	$ 1,478,000
Conversions, preferred (in shares)								(3,033)
Conversions of Series F Preferred Stock and accrued dividends								$ 0	$ 0	$ 0	191,000	0	191,000
Issuances from Preferred Stock conversions (in shares)									288,968	0
Series F Preferred Stock dividends								$ 0	$ 0	$ 0	(89,000)	0	(89,000)
Balance (in shares) at Dec. 31, 2024								545	1,144,926	189
Balance at Dec. 31, 2024								$ 0	$ 0	$ (181,000)	$ 236,458,000	$ (232,274,000)	$ 4,003,000