Note 7 - Commitments and Contingencies - Supplemental Lease Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Right-of-use asset, net and lease liabilities (in thousands)	$ 3,373	$ 3,955
Operating lease expense	1,323	1,239
Cash paid for operating lease liabilities (in thousands)	$ 1,323	$ 1,239
Weighted average remaining lease term (years) (Year)	3 years 2 months 12 days	3 years 6 months
Weighted average discount rate	3.40%	4.10%
Cost of Sales [Member]
Operating lease expense	$ 779	$ 892
General and Administrative Expense [Member]
Operating lease expense	362	272
Research and Development Expense [Member]
Operating lease expense	$ 182	$ 75