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Note 6 - Furniture and Equipment (Tables)
 12 Months Ended
Dec. 31, 2019
Notes Tables  
Property, Plant and Equipment [Table Text Block]
   
201
9
    
201
8
  
                 
Machinery and equipment
   $
16,524
     $
16,089
  
Office furniture
    
49,490
      
52,820
  
     
66,014
      
68,909
  
Less: accumulated depreciation
    
52,468
      
50,338
  
                 
Furniture and equipment, net
   $
13,546
     $
18,571