Note 14 - Revenue - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Revenue	$ 50	$ 104	$ 136	$ 156
Transferred at Point in Time [Member]
Revenue	41	65	63	91
Transferred over Time [Member]
Revenue	9	39	73	65
UNITED STATES
Revenue	43	39	48	80
Europe [Member]
Revenue	1	65	66	76
Asia Pacific [Member]
Revenue	$ 6	$ 0	$ 22	$ 0

Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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+ Details