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Note 2 - Acquisitions and Divestitures - Assets Acquired and Liabilities Assumed (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Oct. 22, 2018
Sep. 20, 2018
Dec. 31, 2017
Dec. 31, 2016
Nov. 10, 2016
Mar. 18, 2016
Intangible assets           $ 4,544  
Goodwill $ 29,868     $ 23,844 $ 23,426    
Restore Flow Allografts [Member]              
Equipment and supplies           125  
Intangible assets           4,544  
Purchase price           12,959  
Goodwill           5,599  
Accounts receivable           394  
Deferred cryopreservation costs           2,583  
Accounts payable           $ (286)  
Cardial [Member]              
Inventory   $ 2,419          
Land and building   750          
Equipment and supplies   94          
Intangible assets   623          
Bargain purchase gain   (1,946)          
Purchase price   $ 1,940          
Applied Medical [Member]              
Inventory     $ 739        
Equipment and supplies     416        
Intangible assets     6,527        
Purchase price     14,043        
Goodwill     6,361        
Deferred cryopreservation costs     $ 3,200        
ProCol Biologic Graft [Member]              
Inventory             $ 2,080
Equipment and supplies             25
Intangible assets             620
Purchase price             3,043
Goodwill             $ 318