Note 14 - Leases (Details Textual)	3 Months Ended		9 Months Ended
	Sep. 30, 2021 USD ($) ft² a	Sep. 30, 2020 USD ($)	Sep. 30, 2021 USD ($) ft² a	Sep. 30, 2021 EUR (€) ft² a	Sep. 30, 2020 USD ($)
Operating Lease, Payments	$ 702,000	$ 219,000	$ 2,000,000.0		$ 653,000
Bothell, Washington Headquarters [Member]
Area of Real Estate Property (Square Foot) | ft²	32,106		32,106	32,106
Lease Agreement, Tenant Allowance			$ 2,600,000
Lessee, Operating Lease, Renewal Term (Year)	5 years		5 years	5 years
Monthly Base Rent Expense			$ 70,000
Menlo Park, California Location [Member]
Area of Real Estate Property (Square Foot) | ft²	3,460		3,460	3,460
Monthly Base Rent Expense			$ 11,000
Albuquerque, New Mexico Location [Member]
Area of Real Estate Property (Square Foot) | ft²	9,932		9,932	9,932
Lessee, Operating Lease, Renewal Term (Year)	3 years		3 years	3 years
Monthly Base Rent Expense			$ 9,000
Detroit, Michigan Location [Member]
Area of Real Estate Property (Square Foot) | ft²	106,998		106,998	106,998
Monthly Base Rent Expense			$ 35,000
United States, First Lease Agreement [Member]
Area of Real Estate Property (Square Foot) | ft²	16,800		16,800	16,800
Monthly Base Rent Expense			$ 14,000
United States, Second Lease Agreement [Member]
Area of Real Estate Property (Square Foot) | ft²	20,000		20,000	20,000
Monthly Base Rent Expense			$ 14,000
United States, Third Lease Agreement [Member]
Area of Real Estate Property (Square Foot) | a	12,500		12,500	12,500
Monthly Base Rent Expense			$ 8,000
The United States of America [Member]
Area of Real Estate Property (Square Foot) | ft²	16,153		16,153	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		26,800	26,800
Lessee, Operating Lease, Renewal Term (Year)	5 years		5 years	5 years
Monthly Base Rent Expense			$ 27,000
Lessee, Operating Lease, Yearly Rent Increase Percentage			2.50%	2.50%
The Netherlands Lease Agreement [Member]
Area of Real Estate Property (Square Foot) | a	47,533		47,533	47,533
Lessee, Operating Lease, Renewal Term (Year)	5 years		5 years	5 years
Monthly Base Rent Expense			$ 33,000	€ 29,000
Lease in Athens, Ohio [Member]
Area of Real Estate Property (Square Foot) | ft²	50,000		50,000	50,000
Monthly Base Rent Expense			$ 23,000
Lease in Columbus, Ohio [Member]
Area of Real Estate Property (Square Foot) | ft²	1,807		1,807	1,807
Monthly Base Rent Expense			$ 4,000
Lease in Nelsonville, Ohio [Member]
Area of Real Estate Property (Square Foot) | ft²	22,764		22,764	22,764
Monthly Base Rent Expense			$ 10,000
Indianapolis Indiana [Member]
Area of Real Estate Property (Square Foot) | ft²	11,415		11,415	11,415
Monthly Base Rent Expense			$ 13,000