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Income Taxes (Narrative) (Details) - USD ($)
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Effective income tax rate 5.00% 56.00% 4.00%
FDII deduction $ (737,000) $ (525,000)  
Interest deductibility threshold 30.00%    
Interest deduction limit $ 10,500,000 6,600,000  
Excess interest not deducted $ 2,400,000 $ 17,700,000  
Federal statutory income tax rate 21.00% 21.00% 34.00%
Valuation allowances against deferred tax assets $ 3,218,000 $ 3,372,000  
Net deferred tax liability 20,363,000 23,156,000  
Federal net operating loss carryforwards related to the acquisitions of Cardiogenesis and Hemosphere 2,700,000    
State net operating loss carryforwards 2,800,000    
Foreign net operating loss carryforwards $ 1,600,000    
Operating loss carryforwards expiration date Dec. 31, 2022    
Research and development tax credit carryforwards $ 631,000    
Total uncertain tax liability including interest and penalties 4,000,000.0 4,300,000  
Uncertain tax liability recorded as reduction to deferred tax assets 300,000 286,000  
Uncertain tax liability recorded to non-current liability 3,700,000 $ 4,000,000.0  
Approximate amount of uncertain tax liability to be recognized in 2020 $ 1,000,000.0    
Research [Member]      
Tax credit carryforwards expiration date Dec. 31, 2026    
Texas Tax Credit [Member]      
State net operating loss carryforwards $ 128,000    
Tax credit carryforwards expiration date Dec. 31, 2027    
Foreign Authority [Member]      
Net deferred tax liability $ 35,000    
Operating loss carryforwards expiration date Dec. 31, 2024