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Note 6 - Segment Information - Schedule of Revenue by Geographic Area (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Revenues	$ 430	$ 838	$ 1,542	$ 2,453
Geographic Concentration Risk [Member] | Revenue Benchmark [Member]
Concentration Risk, Percentage	100.00%	100.00%	100.00%	100.00%
Revenues, percentage	(100.00%)	(100.00%)	(100.00%)	(100.00%)
JAPAN
Revenues	$ 277	$ 534	$ 889	$ 1,324
JAPAN | Geographic Concentration Risk [Member] | Revenue Benchmark [Member]
Concentration Risk, Percentage	64.40%	63.70%	57.70%	53.90%
Revenues, percentage	(64.40%)	(63.70%)	(57.70%)	(53.90%)
SWEDEN
Revenues	$ 38	$ 105	$ 275	$ 328
SWEDEN | Geographic Concentration Risk [Member] | Revenue Benchmark [Member]
Concentration Risk, Percentage	8.80%	12.50%	17.80%	13.40%
Revenues, percentage	(8.80%)	(12.50%)	(17.80%)	(13.40%)
GERMANY
Revenues	$ 11	$ 18	$ 34	$ 105
GERMANY | Geographic Concentration Risk [Member] | Revenue Benchmark [Member]
Concentration Risk, Percentage	2.60%	2.10%	2.20%	4.30%
Revenues, percentage	(2.60%)	(2.10%)	(2.20%)	(4.30%)
CHINA
Revenues	$ 4	$ 3	$ 14	$ 10
CHINA | Geographic Concentration Risk [Member] | Revenue Benchmark [Member]
Concentration Risk, Percentage	0.90%	0.40%	0.90%	0.40%
Revenues, percentage	(0.90%)	(0.40%)	(0.90%)	(0.40%)
KOREA, REPUBLIC OF
Revenues	$ 0	$ 14	$ 1	$ 96
KOREA, REPUBLIC OF | Geographic Concentration Risk [Member] | Revenue Benchmark [Member]
Concentration Risk, Percentage	0.00%	1.70%	0.10%	3.90%
Revenues, percentage	0.00%	(1.70%)	(0.10%)	(3.90%)
Other Foreign Countries [Member]
Revenues	$ (1)	$ 0
Other Foreign Countries [Member] | Geographic Concentration Risk [Member] | Revenue Benchmark [Member]
Concentration Risk, Percentage	0.20%	(0.00%)
Revenues, percentage	(0.20%)	0.00%
Non-US [Member]
Revenues	$ 329	$ 674	$ 1,213	$ 1,863
Non-US [Member] | Geographic Concentration Risk [Member] | Revenue Benchmark [Member]
Concentration Risk, Percentage	76.50%	80.40%	78.70%	75.90%
Revenues, percentage	(76.50%)	(80.40%)	(78.70%)	(75.90%)
UNITED STATES
Revenues	$ 101	$ 164	$ 329	$ 590
UNITED STATES | Geographic Concentration Risk [Member] | Revenue Benchmark [Member]
Concentration Risk, Percentage	23.50%	19.60%	21.30%	24.10%
Revenues, percentage	(23.50%)	(19.60%)	(21.30%)	(24.10%)

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