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Summary Of Significant Accounting Policies (Narrative) (Details) - USD ($)
3 Months Ended 12 Months Ended
Jun. 30, 2014
Sep. 30, 2013
Jun. 30, 2013
Sep. 30, 2012
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Advertising expense         $ 521,000 $ 821,000 $ 880,000,000
ESPP, percentage of market price for eligible employees         85.00%    
Quarterly cash dividend per share of common stock outstanding approved $ 0.03 $ 0.025 $ 0.0275 $ 0.025 $ 0.120 $ 0.118 $ 0.108
Allowance for doubtful accounts         $ 232,000 $ 317,000  
Allowance for notes receivable         0 0  
Write-down to inventory         858,000 140,000 $ 1,200,000
Write-downs to deferred preservation costs         483,000 $ 540,000 448,000
Deferred Tax Assets, Net, Noncurrent         $ 5,300,000    
Minimum [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Estimated useful lives         3 years    
Maximum [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Estimated useful lives         10 years    
Stock Options, RSAs, RSUs, And PSUs [Member] | Minimum [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Vesting period         1 year    
Stock Options, RSAs, RSUs, And PSUs [Member] | Maximum [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Vesting period         3 years    
Stock Options [Member] | Maximum [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Period within grant date stock options granted typically expire         7 years    
PerClot [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Write-down to inventory         $ 764,000    
BioGlue Accessory Product [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Write-down to inventory             684,000
Obsolete Revascularization Technologies Handpieces [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Write-down to inventory             $ 483,000