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Note 9 - Concentrations (Tables)
12 Months Ended
Dec. 31, 2019
Notes Tables  
Schedule of Revenue by Major Customers by Reporting Segments [Table Text Block]
 
 
 
Years Ended December 31,
 
Count
   
2019
   
2018
 
1     $
102,265
    $
254,018
 
2      
69,106
     
156,854
 
3      
51,683
     
93,575
 
4      
51,480
     
93,563
 
5      
43,954
     
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