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Note 9 - Concentrations (Tables)
6 Months Ended
Jun. 30, 2019
Notes Tables  
Schedule of Revenue by Major Customers by Reporting Segments [Table Text Block]
 
 
 
Six Months Ended June 30,
 
Count
   
2019
   
2018
 
1     $
55,740
    $
250,334
 
2      
38,333
     
77,137
 
3      
32,315
     
73,110
 
4      
29,774
     
47,567
 
5      
26,959
     
38,333
 
6      
20,072
     
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