Note 1 - Organization and Significant Accounting Policies (Tables)

3 Months Ended

Mar. 31, 2023

Notes Tables

Schedules of Concentration of Risk, by Risk Factor [Table Text Block]

	Accounts Receivable						Revenue
	March 31,			December 31,			Three Months Ended March 31,
	2023			2022			2023			2022
Customer A		*			15	%		*			*
Customer B		*			*			14	%		20	%
Customer C		12	%		11	%		10	%		11	%

Revenue from External Customers by Products and Services [Table Text Block]

	Three Months Ended March 31,
Product revenue concentration	2023			2022
CryoStor		44	%		35	%
780XLE Freezer		14	%		20	%

	Three Months Ended
	March 31,
Revenue by customers’ geographic locations	2023			2022
United States		79	%		79	%
Europe, Middle East, Africa (EMEA)		18	%		16	%
Canada		1	%		1	%
Other		2	%		4	%
Total revenue		100	%		100	%