Note 9 - Commitments and Contingencies - Supplemental Lease Information (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023
Right-of-use asset, net and lease liabilities (in thousands)	$ 1,685		$ 2,003
Lease expense	$ 299	$ 331
Weighted average remaining lease term (years) (Year)	1 year 9 months 18 days		2 years 9 months 18 days
Weighted average discount rate	3.40%		3.40%
Cost of Sales [Member]
Lease expense	$ 176	183
General and Administrative Expense [Member]
Lease expense	119	108
Research and Development Expense [Member]
Lease expense	$ 4	$ 40