Note 9 - Operating Leases - Supplemental Balance Sheet Information Related to Leases (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Operating lease right-of-use asset	$ 1,685	$ 1,866
Current operating lease liability	621	620
Operating lease liability, net of current portion	1,072	1,247
Total operating lease liability	$ 1,693	$ 1,867
Weighted-average remaining lease term (years) (Year)	3 years 182 days	3 years 255 days
Weighted-average discount rate	4.50%	4.50%