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Note 1 - Organization and Significant Accounting Policies (Details Textual)
12 Months Ended
Sep. 30, 2018
USD ($)
shares
Dec. 31, 2018
USD ($)
shares
Dec. 31, 2017
USD ($)
shares
Jan. 01, 2019
USD ($)
Jan. 22, 2018
Jan. 01, 2017
USD ($)
Dec. 31, 2016
USD ($)
Interest Paid, Including Capitalized Interest, Operating and Investing Activities, Total   $ 5,000 $ 38,000        
Assets, Current, Total   37,564,000 9,931,000        
Assets, Total   45,467,000 12,143,000        
Liabilities, Total   2,319,000 2,051,000        
Net Income (Loss) Attributable to Parent, Total   3,266,000 (2,515,000)        
Liability for Uncertainty in Income Taxes, Current   0          
Advertising Expense   $ 30,000 39,000        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross | shares   0          
Cumulative Effect of New Accounting Principle in Period of Adoption            
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense, Total   $ 0          
Accounting Standards Update 2016-02 [Member] | Subsequent Event [Member]              
Operating Lease, Right-of-Use Asset       $ 1,800,000      
Operating Lease, Liability, Total       $ 1,900,000      
Retained Earnings [Member]              
Net Income (Loss) Attributable to Parent, Total   3,266,000 (2,515,000)        
Cumulative Effect of New Accounting Principle in Period of Adoption           $ 28,000 (28,000)
Additional Paid-in Capital [Member]              
Net Income (Loss) Attributable to Parent, Total          
Cumulative Effect of New Accounting Principle in Period of Adoption           $ 28,000 $ 28,000
Customer Concentration Risk [Member] | Sales Revenue, Net [Member]              
Concentration Risk, Percentage   29.00% 12.00%        
Number of Major Customers   2 1        
Customer Concentration Risk [Member] | Sales Revenue, Net [Member] | CANADA              
Concentration Risk, Percentage   13.00% 11.00%        
Customer Concentration Risk [Member] | Sales Revenue, Net [Member] | Foreign Countries [Member]              
Concentration Risk, Percentage   10.00% 16.00%        
Customer Concentration Risk [Member] | Accounts Receivable [Member]              
Concentration Risk, Percentage   71.00% 41.00%        
Number of Major Customers   3 2        
Product Concentration Risk [Member] | Sales Revenue, Net [Member] | CryoStor Products [Member]              
Concentration Risk, Percentage   88.00% 77.00%        
Minimum [Member]              
Property, Plant and Equipment, Useful Life   3 years          
Maximum [Member]              
Property, Plant and Equipment, Useful Life   10 years          
SAVSU [Member]              
Assets, Current, Total   $ 5,800,000 $ 600,000        
Assets, Total   11,000,000 5,500,000        
Liabilities, Total   500,000 200,000        
Net Income (Loss) Attributable to Parent, Total   $ 1,900,000 $ 2,200,000        
SAVSU [Member]              
Equity Method Investment, Ownership Percentage   44.40% 35.00%   35.00%    
Payments to Acquire Equity Method Investments   $ 6,000,000          
Purchase Option, Term 1 year 180 days            
Purchase Option, Additional Ownership Percentage to be Acquired 56.00%            
Purchase Option, Consideration Transferred, Equity Interests Issuable, Shares | shares 1,000,000            
Purchase Option, Consideration Transferred, Equity Interests Issuable $ 23,000,000            
Employee Stock Option [Member]              
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount | shares     3,400,000        
Warrant [Member]              
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount | shares     6,700,000        
Unvested Stock Awards [Member]              
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount | shares     238,000