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Note 10 - Discontinued Operations (Details Textual) - Discontinued Operations, Held-for-Sale or Disposed of by Sale [Member] - Assets Acquired in The Dental Power Agreement [Member] - USD ($)
3 Months Ended
Mar. 31, 2023
Dec. 31, 2022
Proceeds from Sale of Productive Assets $ 2,000,000  
Disposal Group, Including Discontinued Operation, Payment Term (Year) 5 years  
Gain (Loss) on Disposition of Assets $ 340  
Customer Lists [Member]    
Disposal Group, Including Discontinued Operation, Intangible Assets $ 1,400,000 $ 3,100,000