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Note 8 - Concentrations (Tables)
3 Months Ended
Mar. 31, 2020
Notes Tables  
Schedule of Revenue by Major Customers by Reporting Segments [Table Text Block]
   
Three Months Ended March 31,
 
Count
 
2020
   
2019
 
1   $
41,686
    $
30,322
 
2    
38,333
     
19,674
 
3    
15,651
     
16,644
 
4    
14,307
     
16,458
 
5    
14,172
     
10,562