Note 5 - Leases (Details Textual)	12 Months Ended
	Dec. 31, 2020 USD ($) ft² a	Dec. 31, 2019 USD ($)	Jan. 01, 2019 USD ($)
Operating Lease, Weighted Average Discount Rate, Percent	3.30%	6.50%
Finance Lease, Weighted Average Discount Rate, Percent	5.70%	8.10%
Operating Lease, Weighted Average Remaining Lease Term (Year)	9 years 4 months 24 days	1 year 9 months 18 days
Finance Lease, Weighted Average Remaining Lease Term (Year)	2 years 7 months 6 days	1 year 2 months 12 days
Operating Lease, Right-of-Use Asset	$ 9,675,000	$ 1,040,000	$ 1,300,000
Operating Lease, Payments	1,300,000	$ 778,000
Operating Lease, Liability, Total	$ 9,864,000		1,800,000
SciSafe Holdings, Inc [Member]
Operating Lease, Right-of-Use Asset			$ 1,300,000
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
Operating Lease, Right-of-Use Asset	7,900,000
Operating Lease, Liability, Total	$ 7,900,000
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) | a	106,998
Monthly Base Rent Expense	$ 35,000
Two Locations in the United States [Member]
Area of Real Estate Property (Square Foot) | ft²	32,500
United States, First Lease Agreement [Member]
Monthly Base Rent Expense	$ 13,000
United States, Second 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