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Note 7 - Concentrations (Tables)
6 Months Ended
Jun. 30, 2021
Notes Tables  
Schedule of Revenue by Major Customers by Reporting Segments [Table Text Block]
   

Six Months Ended June 30,

 

Count

  

2021

  

2020

 
1  $54,300  $59,905 
2   49,324   22,407 
3   28,679   20,078 
4   26,644   14,561 
5   24,535   14,172