Note 8 - Segment Reporting - Revenue By Geographic Location (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Revenue	$ 601	$ 578	$ 1,815	$ 1,815
UNITED STATES
Revenue	289	227	862	698
Non-US [Member]
Revenue	$ 312	$ 351	$ 953	$ 1,117

Amount, including 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