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Note 4 - Acquisitions (Details Textual)
3 Months Ended 9 Months Ended
Jun. 22, 2020
USD ($)
Oct. 11, 2019
USD ($)
Jul. 12, 2019
USD ($)
Sep. 30, 2021
USD ($)
Sep. 30, 2020
USD ($)
Sep. 30, 2021
USD ($)
Sep. 30, 2020
USD ($)
Mar. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability           $ (454,000) $ 132,000    
Artegraft Inc [Member]                  
Payments to Acquire Businesses, Gross $ 72,500,000                
Escrow Deposit Disbursements Related to Property Acquisition $ 7,500,000                
Business Combination, Contingent Consideration, Liability, Total                 $ 400,000
Business Acquisition, Purchase Price Allocation, Goodwill Expected Tax Deductible, Period (Year) 15 years                
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life (Year) 12 years 7 months 6 days                
Artegraft Inc [Member] | First Earn-out [Member]                  
Business Combination, Contingent Consideration, Liability, Total $ 5,800,000                
Business Combination, Contingent Consideration, Unit Sales 20,000                
Artegraft Inc [Member] | Second Earn-out [Member]                  
Business Combination, Contingent Consideration, Liability, Total $ 5,800,000                
Business Combination, Contingent Consideration, Unit Sales 24,000                
Artegraft Inc [Member] | Third Earn-out [Member]                  
Business Combination, Contingent Consideration, Liability, Total $ 5,800,000                
Business Combination, Contingent Consideration, Unit Sales 28,800                
Artegraft Inc [Member] | Catch-Up Payment [Member]                  
Business Combination, Contingent Consideration, Liability, Total $ 400,000                
Business Combination, Contingent Consideration, Minimum Unit Sales in Three Years 58,240                
Business Combination, Contingent Consideration, Minimum Unit Sales in Three Years, Percent of Combined Individual Year Targets 80.00%                
Business Combination, Contingent Consideration, Before Multiplied by Fraction $ 17,500,000                
Business Combination, Contingent Consideration, Denominator, Less Amount Paid 72,800                
Artegraft Inc [Member] | Maximum [Member]                  
Business Combination, Consideration Transferred, Total $ 90,000,000.0                
CardioCel and VascuCel Biologic Patches [Member]                  
Payments to Acquire Businesses, Gross   $ 14,200,000              
Business Combination, Contingent Consideration, Liability, Total   7,500,000           $ 2,000,000.0  
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life (Year)           10 years 4 months 24 days      
Goodwill, Purchase Accounting Adjustments         $ (1,300,000)        
CardioCel and VascuCel Biologic Patches [Member] | Technology Licenses [Member]                  
Business Combination, Consideration Transferred, Total   8,000,000.0              
CardioCel and VascuCel Biologic Patches [Member] | Achieving Audited Financial Statements of Acquired Business [Member]                  
Payments to Acquire Businesses, Gross   300,000              
CardioCel and VascuCel Biologic Patches [Member] | First Holdback [Member]                  
Business Combination, Contingent Consideration, Liability, Total   700,000              
CardioCel and VascuCel Biologic Patches [Member] | Revenues Exceeding Twenty Million in the First Twelve Month Period After Closing Date [Member]                  
Business Combination, Contingent Consideration, Liability, Total   2,500,000              
CardioCel and VascuCel Biologic Patches [Member] | Revenues Exceeding Fifteen Million in the First Twelve Month Period After Closing Date [Member]                  
Business Combination, Contingent Consideration, Liability, Total   1,200,000              
CardioCel and VascuCel Biologic Patches [Member] | Revenues Exceeding Thirty Million in the Second Twelve Month Period After Closing Date [Member]                  
Business Combination, Contingent Consideration, Liability, Total   2,500,000              
CardioCel and VascuCel Biologic Patches [Member] | Revenues Exceeding Twenty-Two and a Half Million in the First Twelve Month Period After Closing Date [Member]                  
Business Combination, Contingent Consideration, Liability, Total   1,200,000              
CardioCel and VascuCel Biologic Patches [Member] | Extension of Product Shelf Life from 36 Months to 60 Months in the First Anniversary of Closing Date [Member]                  
Business Combination, Contingent Consideration, Liability, Total   500,000              
CardioCel and VascuCel Biologic Patches [Member] | Third Holdback [Member]                  
Business Combination, Contingent Consideration, Liability, Total   2,000,000.0              
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability       $ (500,000)          
CardioCel and VascuCel Biologic Patches [Member] | Third Holdback [Member] | CardioCel Product [Member]                  
Business Combination, Contingent Consideration, Liability, Percent       75.00%   75.00%      
CardioCel and VascuCel Biologic Patches [Member] | Third Holdback [Member] | VascuCel Product [Member]                  
Business Combination, Contingent Consideration, Liability, Percent       25.00%   25.00%      
CardioCel and VascuCel Biologic Patches [Member] | Maximum [Member] | Biological Patch Business Assets [Member]                  
Business Combination, Consideration Transferred, Total   $ 15,300,000              
Tru-Incise Valve Cutter [Member]                  
Business Combination, Consideration Transferred, Total     $ 8,000,000.0            
Payments to Acquire Businesses, Gross     $ 6,800,000            
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life (Year)     11 years 9 months 18 days            
Business Combination, Deferred Purchase Consideration, Installment Payment     $ 400,000            
Business Combination, Deferred Purchase Consideration     1,200,000            
Acquisition Date Fair Value     $ 1,100,000            
Business Combination ,Fair Value Inputs, Discount Rate     4.19%