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Note 4 - Acquisitions - Assets Acquired and Liabilities Assumed (Details) - USD ($)
$ in Thousands
Jun. 30, 2022
Dec. 31, 2021
Jun. 22, 2020
Goodwill $ 65,945 $ 65,945  
Artegraft Inc [Member]      
Inventory     $ 3,859
Accounts receivable     1,789
Equipment and supplies     1,140
Accounts payable and other     53
Intangible assets     39,056
Goodwill     27,115
Purchase price     $ 72,906