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Note 9 - Concentrations (Tables)
3 Months Ended
Mar. 31, 2019
Notes Tables  
Schedule of Revenue by Major Customers by Reporting Segments [Table Text Block]
 
 
 
Three Months Ended March 31,
 
Count
   
2019
   
2018
 
1     $
30,322
    $
138,519
 
2      
19,674
     
39,899
 
3      
16,644
     
34,723
 
4      
16,458
     
24,193
 
5      
10,562
     
19,764