Note 6 - Leases (Details Textual) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Operating Lease, Right-of-Use Asset	$ 1,471	$ 1,828
Operating Lease, Liability, Total	$ 1,586
Minimum [Member]
Lessee, Operating Lease, Remaining Lease Term (Year)	1 year
Maximum [Member]
Lessee, Operating Lease, Remaining Lease Term (Year)	8 years
Corporate Office Facility in Seattle, Washington [Member]
Lessee, Operating Lease, Term of Contract (Month)		7 years 90 days
Operating Lease, Right-of-Use Asset		$ 1,200
Operating Lease, Liability, Total		$ 1,200