Note 12 - Revenue - Disaggregated Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Net product sales	$ 6,604	$ 5,293	$ 19,075	$ 14,286
Regenerative Medicine [Member]
Net product sales	3,421	2,876	9,567	7,965
Media [Member]
Net product sales	6,069	5,293	18,165	14,286
Distribution Service [Member]
Net product sales	2,613	1,887	7,943	4,621
Automated Thawing Products [Member]
Net product sales	324		699
Drug Discovery [Member]
Net product sales	225	276	711	916
Cold Chain Shipping [Member]
Net product sales	211		211
BioBanking [Member]
Net product sales	$ 345	$ 255	$ 854	$ 784