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Note 6 - Furniture and Equipment (Tables)
12 Months Ended
Dec. 31, 2018
Notes Tables  
Property, Plant and Equipment [Table Text Block]
   
2018
   
2017
 
                 
Machinery and equipment
  $
16,089
    $
14,764
 
Office furniture
   
52,820
     
51,186
 
     
68,909
     
65,950
 
Less: accumulated depreciation
   
50,338
     
40,214
 
                 
Furniture and equipment, net
  $
18,571
    $
25,736