Note 5 - Leases - Supplemental Balance Sheet Information (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022	Jun. 30, 2022
Right-of-use lease assets	$ 1,170	$ 1,297	$ 1,431
Current portion of operating lease liability	373	362	355
Operating lease liability, net of current portion	908	$ 1,051	1,196
Total operating lease liabilities	$ 1,281		$ 1,551
Weighted average remaining lease term (years) (Year)	3 years 9 months 18 days		4 years 8 months 12 days
Weighted average discount rate	8.50%		8.50%