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Note 3 - Acquisitions - Fair Value of Assets Acquired (Details) - USD ($)
Dec. 31, 2023
Dec. 31, 2022
Nov. 09, 2022
May 31, 1988
Goodwill $ 5,714,000 $ 5,714,000   $ 7,006,000
ATEC Acquisition [Member]        
Inventory     $ 80,000  
Property, plant and equipment     169,000  
Identifiable intangibles     50,000  
Goodwill     1,901,000  
Total estimated purchase price     $ 2,200,000