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Note 1 - Organization and Significant Accounting Policies (Details Textual)
3 Months Ended 12 Months Ended
Mar. 31, 2021
USD ($)
Mar. 31, 2020
Dec. 31, 2020
USD ($)
Oct. 01, 2020
USD ($)
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Ending Balance $ 89,000,000.0   $ 90,400,000  
Deferred Tax Payments, Social Security $ 432,000      
Deferred Social Security Tax Payments Payback, Percentage Tranche One 50.00%      
Deferred Social Security Tax Payments Payback, Percentage Tranche Two 50.00%      
Customer Concentration Risk [Member] | Revenue Benchmark [Member]        
Concentration Risk, Percentage   25.00%    
Customer Concentration Risk [Member] | Revenue Benchmark [Member] | CryoStor Products [Member]        
Concentration Risk, Percentage 48.00% 66.00%    
Customer Concentration Risk [Member] | Accounts Receivable [Member]        
Concentration Risk, Percentage 10.00%   17.00%  
Number of Major Customers 1   1  
Supplier Concentration Risk [Member] | Accounts Payable [Member]        
Number of Suppliers     1  
Supplier Concentration Risk [Member] | Accounts Payable [Member] | One Supplier [Member]        
Concentration Risk, Percentage     21.00%  
Paycheck Protection Program CARES Act [Member]        
Debt Instrument, Interest Rate, Stated Percentage 1.00%      
Paycheck Protection Program CARES Act [Member] | SciSafe Holdings, Inc [Member]        
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Long-term Debt       $ 295,300
Debt Instrument, Interest Rate, Stated Percentage       1.00%