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Note 8 - Concentrations (Tables)
6 Months Ended
Jun. 30, 2020
Notes Tables  
Schedule of Revenue by Major Customers by Reporting Segments [Table Text Block]
 
 
 
Six Months Ended June 30,
 
Count
   
2020
   
2019
 
1     $
59,905
    $
55,740
 
2      
22,407
     
38,333
 
3      
20,078
     
32,315
 
4      
14,561
     
29,774
 
5      
14,172
     
26,959
 
6      
-
     
20,072