Note 2 - Summary of Significant Accounting Policies - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2024	Dec. 31, 2023
Revenue from Contract with Customer, Excluding Assessed Tax	$ 420	$ 442
UNITED STATES
Revenue from Contract with Customer, Excluding Assessed Tax	278	331
Europe [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	$ 142	$ 111

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