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Note 1 - Organization and Significant Accounting Policies (Details Textual)
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2019
USD ($)
Sep. 30, 2018
USD ($)
Sep. 30, 2019
USD ($)
Sep. 30, 2018
USD ($)
Dec. 31, 2018
USD ($)
Aug. 08, 2019
Jan. 01, 2019
USD ($)
Operating Lease, Right-of-Use Asset $ 1,177,000   $ 1,177,000     $ 1,300,000
Operating Lease, Liability, Total 1,524,000   1,524,000       $ 1,800,000
Deferred Rent Credit         $ 479,000    
Net Income (Loss) Attributable to Parent, Total 9,316,000 $ 1,231,000 10,581,000 $ 2,373,000      
Income (Loss) from Equity Method Investments, Total $ (291,000) $ (43,000) $ (739,000) $ (363,000)      
Customer Concentration Risk [Member] | Revenue Benchmark [Member]              
Concentration Risk, Percentage 33.00% 41.00% 17.00% 28.00%      
Number of Major Customers 3 3 1 2      
Customer Concentration Risk [Member] | Revenue Benchmark [Member] | CANADA              
Concentration Risk, Percentage 12.00% 15.00% 17.00% 13.00%      
Customer Concentration Risk [Member] | Revenue Benchmark [Member] | Non-US [Member]              
Concentration Risk, Percentage 11.00% 8.00% 14.00% 10.00%      
Customer Concentration Risk [Member] | Revenue Benchmark [Member] | CryoStor Products [Member]              
Concentration Risk, Percentage 81.00% 90.00% 84.00% 88.00%      
Customer Concentration Risk [Member] | Accounts Receivable [Member]              
Concentration Risk, Percentage     11.00%   71.00%    
Number of Major Customers     1   3    
SAVSU [Member]              
Income (Loss) from Equity Method Investments, Total $ (300,000) $ (43,000) $ (700,000) $ (400,000)      
SAVSU [Member]              
Net Income (Loss) Attributable to Parent, Total (700,000) $ (16,000) (1,700,000) $ (1,100,000)      
Convertible Debt Securities [Member]              
Debt Securities, Held-to-maturity, Total $ 1,000,000   $ 1,000,000        
SAVSU [Member]              
Business Acquisition, Percentage of Voting Interests Acquired           55.60%