Note 6 - Segment Information - Schedule of Revenue by Geographic Area (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Revenues	$ 614	$ 513
Geographic Concentration Risk [Member] \| Revenue Benchmark [Member]
Concentration Risk, Percentage	100.00%	100.00%
JAPAN
Revenues	$ 430	$ 350
JAPAN \| Geographic Concentration Risk [Member] \| Revenue Benchmark [Member]
Concentration Risk, Percentage	70.00%	68.30%
SWEDEN
Revenues	$ 57	$ 33
SWEDEN \| Geographic Concentration Risk [Member] \| Revenue Benchmark [Member]
Concentration Risk, Percentage	9.30%	6.40%
GERMANY
Revenues	$ 7	$ 10
GERMANY \| Geographic Concentration Risk [Member] \| Revenue Benchmark [Member]
Concentration Risk, Percentage	1.10%	1.90%
CHINA
Revenues	$ 1	$ 6
CHINA \| Geographic Concentration Risk [Member] \| Revenue Benchmark [Member]
Concentration Risk, Percentage	0.20%	1.20%
Other Foreign Countries [Member]
Revenues	$ 0	$ 1
Other Foreign Countries [Member] \| Geographic Concentration Risk [Member] \| Revenue Benchmark [Member]
Concentration Risk, Percentage	0.00%	0.20%
Non-US [Member]
Revenues	$ 495	$ 400
Non-US [Member] \| Geographic Concentration Risk [Member] \| Revenue Benchmark [Member]
Concentration Risk, Percentage	80.60%	78.00%
UNITED STATES
Revenues	$ 119	$ 113
UNITED STATES \| Geographic Concentration Risk [Member] \| Revenue Benchmark [Member]
Concentration Risk, Percentage	19.40%	22.00%