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Note 7 - Concentrations (Tables)
3 Months Ended
Mar. 31, 2021
Notes Tables  
Schedule of Revenue by Major Customers by Reporting Segments [Table Text Block]
 
 
 
Three Months Ended March 31,
 
Count
   
2021
   
2020
 
1     $
54,300
    $
41,686
 
2      
13,990
     
38,333
 
3      
11,359
     
15,651
 
4      
10,563
     
14,307
 
5      
9,583
     
14,172