Note 13 - Leases (Details Textual)	3 Months Ended
	Mar. 31, 2021 USD ($) ft²	Mar. 31, 2020 USD ($)
Operating Lease, Payments	$ 537,000	$ 217,000
Bothell, Washington Headquarters [Member]
Area of Real Estate Property (Square Foot) | ft²	32,106
Lease Agreement, Tenant Allowance	$ 2,600,000
Lessee, Operating Lease, Renewal Term (Year)	5 years
Monthly Base Rent Expense	$ 65,000
Menlo Park, California Location [Member]
Area of Real Estate Property (Square Foot) | ft²	3,460
Monthly Base Rent Expense	$ 11,000
Albuquerque, New Mexico Location [Member]
Area of Real Estate Property (Square Foot) | ft²	9,932
Lessee, Operating Lease, Renewal Term (Year)	3 years
Monthly Base Rent Expense	$ 9,000
Detroit, Michigan Location [Member]
Area of Real Estate Property (Square Foot) | ft²	106,998
Monthly Base Rent Expense	$ 35,000
Three Locations in the United States [Member]
Area of Real Estate Property (Square Foot) | ft²	49,300
United States, First Lease Agreement [Member]
Monthly Base Rent Expense	$ 14,000
United States, Second Lease Agreement [Member]
Monthly Base Rent Expense	13,000
United States, Third Lease Agreement [Member]
Monthly Base Rent Expense	$ 8,000
The United States of America [Member]
Area of Real Estate Property (Square Foot) | ft²	16,153
Monthly Base Rent Expense	$ 13,000
The United States of America, Second Lease [Member]
Area of Real Estate Property (Square Foot) | ft²	26,800
Monthly Base Rent Expense	$ 27,000
Lessee, Operating Lease, Term of Contract (Year)	10 years 5 months
Lessee, Operating Lease, Yearly Rent Increase Percentage	2.50%