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Note 3 - Related Party Transactions (Details Textual) - USD ($)
3 Months Ended 6 Months Ended 12 Months Ended
Mar. 12, 2018
Aug. 21, 2017
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Apr. 16, 2018
Apr. 01, 2018
Mar. 31, 2017
Amortization of Debt Discount (Premium)         $ 1,229,000 $ 350,000        
Interest Expense, Total     $ 1,211,000 $ 733,000 2,343,000 1,093,000        
Adjustments for New Accounting Principle, Early Adoption [Member] | Accounting Standards Update 2017-11 [Member]                    
Debt Instrument, Unamortized Discount, Total     1,513,000   1,513,000       $ 7,200,000  
Amortization of Debt Discount (Premium)     586,000 350,000 1,172,000 350,000        
Boyalife Investment Fund II, Inc. [Member] | Convertible Debt [Member]                    
Debt Instrument, Convertible, Conversion Price             $ 1.80 $ 16.10    
Boyalife Investment Fund II, Inc. [Member] | Revolving Credit Facility [Member]                    
Line of Credit Facility, Maximum Borrowing Capacity     10,000,000   10,000,000         $ 10,000,000
Proceeds from Long-term Lines of Credit         8,713,000   $ 7,200,000      
Line of Credit Facility, Remaining Borrowing Capacity     $ 1,287,000   $ 1,287,000          
Debt Instrument, Interest Rate, Stated Percentage     22.00%   22.00%          
Interest Expense, Total     $ 466,000 382,000 $ 926,000 742,000        
Interest Payable     926,000   926,000   $ 1,513,000      
Boyalife W.S.N. [Member]                    
Distributor Agreement Term   3 years                
Distributor Agreement, Renewal Term   2 years                
Revenue from Related Parties     $ 315,000 $ 43,000 $ 581,000 $ 269,000        
IncoCell [Member]                    
Contract Development Revenue, Term 10 years