Note 8 - Commitments and Contingencies - Supplemental Lease Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Right-of-use asset, net and lease liabilities (in thousands)	$ 2,003	$ 3,373
Operating lease expense	1,339	1,323
Cash paid for operating lease liabilities (in thousands)	$ 1,339	$ 1,323
Weighted average remaining lease term (years) (Year)	2 years 9 months 18 days	3 years 2 months 12 days
Weighted average discount rate	3.40%	3.40%
Cost of Sales [Member]
Operating lease expense	$ 744	$ 779
General and Administrative Expense [Member]
Operating lease expense	458	362
Research and Development Expense [Member]
Operating lease expense	$ 137	$ 182