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Note 13 - Fair Value Measurements (Details Textual) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended 12 Months Ended
Sep. 30, 2023
Dec. 31, 2022
Sep. 30, 2021
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2019
Oct. 11, 2019
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability       $ (78) $ (108) $ (674)    
Artegraft Inc [Member]                
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High       17,500        
Business Combination, Contingent Consideration, Liability       400        
CardioCel and VascuCel Biologic Patches [Member]                
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High             $ 7,800  
CardioCel and VascuCel Biologic Patches [Member] | Fair Value, Inputs, Level 3 [Member]                
Business Combination, Contingent Consideration, Liability               $ 2,300
CardioCel and VascuCel Biologic Patches [Member] | Third Holdback [Member]                
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High $ 2,000           2,000  
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability $ 100 $ (100) $ (500) $ 100        
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  
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  
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