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Note 10 - Concentrations (Tables)
12 Months Ended
Dec. 31, 2018
Notes Tables  
Schedule of Revenue by Major Customers by Reporting Segments [Table Text Block]
Count
   
2018
   
2017
 
1     $
254,018
    $
179,292
 
2      
156,854
     
163,483
 
3      
93,575
     
131,837
 
4      
93,563
     
113,280
 
5      
-
     
70,760
 
6      
-
     
61,677
 
7      
-
     
51,814