Note 6 - Leases (Details Textual) - USD ($)	Nov. 09, 2020	Mar. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Operating Lease, Right-of-Use Asset		$ 1,773,000	$ 1,853,000
Operating Lease, Liability, Total		$ 1,896,000
Minimum [Member]
Lessee, Operating Lease, Remaining Lease Term (Year)		5 years
Maximum [Member]
Lessee, Operating Lease, Remaining Lease Term (Year)		7 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				$ 1,200,000
Office Facility in the UK [Member]
Operating Lease, Right-of-Use Asset			365,559
Lessee, Operating Lease, Renewal Term (Month)	10 years
Lessee Operating Lease, Termination Option Term (Year)	5 years
Operating Lease, Liability, Total			$ 365,559