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Note 3 - Property and Equipment (Tables)
12 Months Ended
Dec. 31, 2021
Notes Tables  
Property, Plant and Equipment [Table Text Block]
   
2021
   
2020
 
Equipment and furnishings
  $
591,554
    $
543,836
 
Leasehold improvements
   
115,605
     
115,605
 
Total property and equipment
   
707,159
     
659,441
 
Accumulated depreciation and amortization
   
(550,221
)    
(511,700
)
Property and equipment, net
  $
156,938
    $
147,741