Consolidated Statements of Changes in Stockholders' Equity - USD ($) $ in Thousands	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Total
Balance (in shares) at Dec. 31, 2022	524,231,000
Balance at Dec. 31, 2022	$ 5,242	$ 296,460	$ (278,602)	$ 23,100
Funds received from sale of DSPP units and shares and exercise of warrants (in shares)	115,621,000
Funds received from sale of DSPP units and shares and exercise of warrants	$ 1,156	5,793	0	$ 6,949
Funds received from option exercises (in shares)	150,000			150,000
Funds received from option exercises	$ 2	10	0	$ 12
Costs associated with the issuance of shares	0	(1,120)	0	(1,120)
Value of options granted to employees, directors and others as non-cash compensation	0	1,034	0	1,034
Net loss	$ 0	0	(7,957)	(7,957)
Balance (in shares) at Dec. 31, 2023	640,002,000
Balance at Dec. 31, 2023	$ 6,400	302,177	(286,559)	22,018
Funds received from sale of DSPP units and shares and exercise of warrants (in shares)	324,821,000
Funds received from sale of DSPP units and shares and exercise of warrants	$ 3,248	13,009	0	$ 16,257
Funds received from option exercises (in shares)	539,000			538,175
Funds received from option exercises	$ 6	30	0	$ 36
Costs associated with the issuance of shares	0	(2,921)	0	(2,921)
Value of options granted to employees, directors and others as non-cash compensation	0	334	0	334
Net loss	$ 0	0	(7,343)	(7,343)
Balance (in shares) at Dec. 31, 2024	965,362,000
Balance at Dec. 31, 2024	$ 9,654	$ 312,629	$ (293,902)	$ 28,381