Note 10 - Segment Information - Schedule of Revenue by Geographic Area (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024
Revenues	$ 2,062	$ 3,108
Geographic Concentration Risk [Member] \| Revenue Benchmark [Member]
Concentration Risk, Percentage	100.00%	100.00%
JAPAN
Revenues	$ 1,276	$ 1,731
JAPAN \| Geographic Concentration Risk [Member] \| Revenue Benchmark [Member]
Concentration Risk, Percentage	62.00%	55.80%
SWEDEN
Revenues	$ 300	$ 365
SWEDEN \| Geographic Concentration Risk [Member] \| Revenue Benchmark [Member]
Concentration Risk, Percentage	14.50%	11.70%
GERMANY
Revenues	$ 42	$ 116
GERMANY \| Geographic Concentration Risk [Member] \| Revenue Benchmark [Member]
Concentration Risk, Percentage	2.00%	3.70%
CHINA
Revenues	$ 16	$ 97
CHINA \| Geographic Concentration Risk [Member] \| Revenue Benchmark [Member]
Concentration Risk, Percentage	0.80%	3.10%
KOREA, REPUBLIC OF
Revenues	$ 1	$ 31
KOREA, REPUBLIC OF \| Geographic Concentration Risk [Member] \| Revenue Benchmark [Member]
Concentration Risk, Percentage	0.00%	1.00%
Other Foreign Countries [Member]
Revenues	$ 2	$ 5
Other Foreign Countries [Member] \| Geographic Concentration Risk [Member] \| Revenue Benchmark [Member]
Concentration Risk, Percentage	0.10%	0.20%
Non-US [Member]
Revenues	$ 1,637	$ 2,345
Non-US [Member] \| Geographic Concentration Risk [Member] \| Revenue Benchmark [Member]
Concentration Risk, Percentage	79.40%	75.50%
UNITED STATES
Revenues	$ 425	$ 763
UNITED STATES \| Geographic Concentration Risk [Member] \| Revenue Benchmark [Member]
Concentration Risk, Percentage	20.60%	24.50%