Note 5 - Leases - Supplemental Balance Sheet Information (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022	Sep. 30, 2022
Right-of-use lease assets	$ 732	$ 1,297	$ 1,340
Current portion of operating lease liability	373	362	351
Operating lease liability, net of current portion	824	$ 1,051	1,107
Total operating lease liabilities	$ 1,197		$ 1,458
Weighted average remaining lease term (years) (Year)	3 years 6 months		4 years 6 months
Weighted average discount rate	8.50%		8.50%