Note 12 - Revenue - Revenues by Product Line (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Revenue from Contract with Customer, Including Assessed Tax	$ 9,920	$ 6,701	$ 22,082	$ 12,471
Biopreservation Media [Member]
Revenue from Contract with Customer, Including Assessed Tax	6,667	6,327	15,339	12,097
Automated Thawing Products [Member]
Revenue from Contract with Customer, Including Assessed Tax	376	374	770	374
Evo Shippers [Member]
Revenue from Contract with Customer, Including Assessed Tax	439	0	877	0
Freezers and Accessories [Member]
Revenue from Contract with Customer, Including Assessed Tax	$ 2,438	$ 0	$ 5,096	$ 0