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Note 5 - Property and Equipment (Tables)
3 Months Ended
Mar. 31, 2022
Notes Tables  
Property, Plant and Equipment [Table Text Block]
   

March 31,

2022

   

December 31,

2021

 

Equipment and furnishings

  $ 653,740     $ 591,554  

Leasehold improvements

    115,605       115,605  

Total property and equipment

    769,345       707,159  

Accumulated depreciation and amortization

    (562,490 )     (550,221 )

Property and equipment, net

  $ 206,855     $ 156,938