Note 12 - Revenue - Revenues by Product Line (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Total revenue	$ 11,279	$ 6,604	$ 33,361	$ 19,075
Biopreservation Media [Member]
Total revenue	7,414	6,069	22,753	18,165
Automated Thawing Products [Member]
Total revenue	277	324	1,047	699
Evo Shippers [Member]
Total revenue	494	211	1,372	211
Freezers and Accessories [Member]
Total revenue	$ 3,094	$ 0	$ 8,189	$ 0