Segment Information (Details - Operating segment) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2025	Mar. 31, 2025	Jun. 30, 2024	Mar. 31, 2024	Jun. 30, 2025	Jun. 30, 2024	Dec. 31, 2024
Segment Reporting Information [Line Items]
Research and development expense	$ (1,074)		$ (866)		$ (1,960)	$ (2,014)
General and administrative expense	(1,235)		(1,048)		(2,221)	(2,109)
Net loss	(2,166)	$ (1,769)	(1,846)	$ (2,154)	(3,935)	(4,000)
Total assets	11,301				11,301		$ 5,738
Operating Segments [Member]
Segment Reporting Information [Line Items]
Research and development expense	(1,074)		(866)		(1,960)	(2,014)
General and administrative expense	(1,235)		(1,048)		(2,221)	(2,109)
Impairment loss on property and equipment	0		0		0	0
Other income	24		4		2	6
Interest income	119		66		244	121
Interest expense	0		(2)		0	(4)
Net loss	(2,166)		(1,846)		(3,935)	(4,000)
Total assets	$ 11,301		$ 5,296		$ 11,301	$ 5,296