Note 2 - Summary of Significant Accounting Policies - 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 from Contract with Customer, Excluding Assessed Tax	$ 226	$ 96	$ 581	$ 271
UNITED STATES
Revenue from Contract with Customer, Excluding Assessed Tax	172	62	480	129
Europe [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	$ 54	$ 34	$ 101	$ 142