Note 8 - Operating Leases - Supplemental Balance Sheet Information Related to Leases (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Operating lease right-of-use asset	$ 2,303	$ 1,866
Current operating lease liability	669	620
Operating lease liability, net of current portion	1,643	1,247
Total operating lease liability	$ 2,312	$ 1,867
Weighted-average remaining lease term (years) (Year)	3 years 7 months 6 days	3 years 8 months 12 days
Weighted-average discount rate	4.50%	4.50%