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Note 14 - Fair Value Measurements (Details Textual) - USD ($)
Jun. 30, 2020
Jun. 22, 2020
Dec. 31, 2019
Oct. 11, 2019
CardioCel and VascuCel Biologic Patches [Member]        
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High     $ 7,800,000  
CardioCel and VascuCel Biologic Patches [Member] | Audited Carve-Out Financial Statements of the Acquired Business [Member]        
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High     300,000  
CardioCel and VascuCel Biologic Patches [Member] | Third Holdback [Member]        
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High     2,000,000.0  
Business Combination, Contingent Consideration, Liability, Total       $ 2,000,000.0
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 Arrangements, Range of Outcomes, Value, High     500,000  
Business Combination, Contingent Consideration, Liability, Total       500,000
CardioCel and VascuCel Biologic Patches [Member] | Achievement of Specified Levels of Revenues [Member]        
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High     $ 5,000,000.0  
Artegraft Inc [Member]        
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High   $ 17,500,000    
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, Percent of Combined Individual Year Targets   80.00%    
Business Combination, Contingent Consideration, Before Multiplied by Fraction   $ 17,500,000    
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member]        
Assets, Fair Value Disclosure $ 0      
Fair Value, Inputs, Level 3 [Member] | CardioCel and VascuCel Biologic Patches [Member]        
Business Combination, Contingent Consideration, Liability, Total       $ 2,300,000