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Note 1 - Organization and Significant Accounting Policies (Details Textual)
1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Jul. 07, 2020
USD ($)
$ / shares
shares
Apr. 29, 2020
USD ($)
Apr. 20, 2020
USD ($)
Nov. 12, 2019
USD ($)
Apr. 01, 2019
USD ($)
Mar. 30, 2020
USD ($)
Jun. 30, 2020
USD ($)
Jun. 30, 2019
USD ($)
Jun. 30, 2020
USD ($)
Jun. 30, 2019
USD ($)
Dec. 31, 2019
USD ($)
May 22, 2020
USD ($)
$ / shares
Mar. 31, 2020
USD ($)
Cash and Cash Equivalents, at Carrying Value, Ending Balance             $ 29,879,000   $ 29,879,000   $ 6,448,000    
Payment for Contingent Consideration Liability, Financing Activities                 483,000 $ (0)      
Revenue from Contract with Customer, Including Assessed Tax             9,920,000 $ 6,701,000 22,082,000 12,471,000      
Business Combination, Contingent Consideration, Liability, Total             $ 388,000   388,000       $ 1,900,000
Impairment of Intangible Assets (Excluding Goodwill), Total                 0        
Proceeds from Issuance of Debt                 2,175,000 0      
Repayments of Debt                 $ 2,175,000 $ (0)      
Customer Concentration Risk [Member] | Revenue Benchmark [Member]                          
Concentration Risk, Percentage             25.00% 17.00% 13.00% 20.00%      
Number of Major Customers             2 1 1 1      
Customer Concentration Risk [Member] | Accounts Receivable [Member]                          
Concentration Risk, Percentage                 22.00%   25.00%    
Number of Major Customers                 2   2    
Paycheck Protection Program CARES Act [Member]                          
Proceeds from Issuance of Debt     $ 2,175,320                    
Repayments of Debt   $ 2,175,320                      
Cryopreservation Media [Member] | Minimum [Member] | COVID 19 [Member]                          
Revenue from Contract with Customer, Including Assessed Tax           $ 1,500,000              
Cryopreservation Media [Member] | Maximum [Member] | COVID 19 [Member]                          
Revenue from Contract with Customer, Including Assessed Tax           $ 2,000,000.0              
CryoStor Products [Member] | Product Concentration Risk [Member] | Revenue Benchmark [Member]                          
Concentration Risk, Percentage             62.00% 82.00%          
Subsequent Event [Member]                          
Stock Issued During Period, Shares, New Issues (in shares) | shares 5,951,250                        
Shares Issued, Price Per Share (in dollars per share) | $ / shares $ 14.50                        
Proceeds from Issuance of Common Stock, Net $ 81,000,000                        
Subsequent Event [Member] | Over-Allotment Option [Member]                          
Stock Issued During Period, Shares, New Issues (in shares) | shares 776,250                        
Casdin Capital LLC [Member]                          
Share Repurchase Agreement, Value of Shares to be Issued                       $ 20,000,000  
Share Price (in dollars per share) | $ / shares                       $ 10.50  
Astero [Member]                          
Payments to Acquire Businesses, Gross         $ 12,521,000                
Business Combination, Contingent Consideration Arrangements, Change in Range of Outcomes, Contingent Consideration, Liability, Value, High         8,500,000                
Payment for Contingent Consideration Liability, Financing Activities             $ 483,000            
Payments to Acquire Businesses, Initial Cash Payment         8,000,000.0                
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High         8,500,000                
Business Combination, Contingent Consideration, Liability, Total         $ 1,500,000                
CBS Acquisition [Member]                          
Payments to Acquire Businesses, Gross       $ 11,000,000                  
Payments to Acquire Businesses, Initial Cash Payment       11,000,000.0                  
Business Combination, Consideration Transferred, Equity Interests Issued and Issuable       4,000,000.0                  
CBS Acquisition [Member] | Earning Payments Payable in Each Calendar Year 2020, 2021, 2022, 2023, and 2024 [Member]                          
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High       $ 15,000,000.0