Note 5 - Leases - Supplemental Balance Sheet Information (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021	Sep. 30, 2021
Right-of-use lease assets	$ 1,340	$ 1,598	$ 1,660
Current portion of operating lease liability	351	357	354
Operating lease liability, net of current portion	1,107	$ 1,363	1,430
Total operating lease liabilities	$ 1,458		$ 1,784
Weighted average remaining lease term (years) (Year)	4 years 6 months		5 years 4 months 24 days
Weighted average discount rate	8.50%		8.50%