Note 1 - Organization and Significant Accounting Policies - Concentrations Risk by Geographic Locations (Details) - Revenue Benchmark [Member]	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Product Concentration Risk [Member] | CryoStor Products [Member]
Revenue	44.00%	35.00%
Product Concentration Risk [Member] | 780XLE Freezer Line [Member]
Revenue	14.00%	20.00%
Geographic Concentration Risk [Member] | UNITED STATES
Revenue	79.00%	79.00%
Geographic Concentration Risk [Member] | EMEA [Member]
Revenue	18.00%	16.00%
Geographic Concentration Risk [Member] | CANADA
Revenue	1.00%	1.00%
Geographic Concentration Risk [Member] | Geographic, Other [Member]
Revenue	2.00%	4.00%
Geographic Concentration Risk [Member] | All Location [Member]
Revenue	100.00%	100.00%