Note 2 - Summary of Significant Accounting Policies - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2026	Mar. 31, 2025
Revenue from Contract with Customer, Excluding Assessed Tax	$ 432	$ 143
Revenues	432	143
Product [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	248	143
Revenues	248	143
Product [Member] \| UNITED STATES
Revenue from Contract with Customer, Excluding Assessed Tax	94	135
Revenues	94	135
Product [Member] \| Europe [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	154	8
Revenues	154	8
Service [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	184	0
Revenues	184	0
Service [Member] \| UNITED STATES
Revenue from Contract with Customer, Excluding Assessed Tax	184	0
Revenues	184	0
Service [Member] \| Europe [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	0	0
Revenues	$ 0	$ 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