Note 5 - Leases - Supplemental Balance Sheet Information (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022	Mar. 31, 2022
Right-of-use lease assets	$ 1,234	$ 1,297	$ 1,522
Current portion of operating lease liability	367	362	358
Operating lease liability, net of current portion	981	$ 1,051	1,286
Total operating lease liabilities	$ 1,348		$ 1,644
Weighted-average remaining lease term (years) (Year)	4 years		4 years 10 months 24 days
Weighted-average discount rate	8.50%		8.50%