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	$ 146	$ 126	$ 302	$ 600
Product [Member] | Sales Channel, Directly to Consumer [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	137	130	277	557
Product [Member] | Sales Channel, Through Intermediary [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	24	16	48	110
Returns [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	$ (15)	$ (20)	$ (23)	$ (67)