Note 1 - Organization and Significant Accounting Policies - Revenues by Product Line (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020		Dec. 31, 2019	[2]
Total revenue	$ 48,087	[1]	$ 27,371
Biopreservation Media [Member]
Total revenue	30,946	[1]	23,358
Automated Thawing Products [Member]
Total revenue	1,709	[1]	1,184
Product Revenue from Cold Chain Management [Member]
Total revenue	46	[1]	165
Freezers and Accessories [Member]
Total revenue	11,839	[1]	2,137
Product [Member]
Total revenue	44,540		26,844
Rental Revenue from Cold Chain Management [Member]
Total revenue	1,795		527
Rental Revenue [Member]
Total revenue	1,795		527
Biological and Pharmaceutical Storage [Member]
Total revenue	1,752	[1]	0
Service Revenue [Member]
Total revenue	$ 1,752		$ 0

[1] 2020 revenue includes service revenue related to SciSafe from October 1, 2020 through December 31, 2020.

[2] 2019 revenue includes automated thawing revenue related to Astero from April 1, 2019 through December 31, 2019; evo shipper rental revenue related to SAVSU from August 8, 2019 through December 31, 2019; and freezer and accessory revenue related to CBS from November 12, 2019 through December 31, 2019.