Note 8 - Segment Reporting - Revenue From External Customers by Geographic Areas (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Revenue	$ 578	$ 872	$ 1,815	$ 2,866
UNITED STATES
Revenue	227	356	698	1,356
Non-US [Member]
Revenue	$ 351	$ 516	$ 1,117	$ 1,510

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