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Note 7 - Concentrations (Tables)
3 Months Ended
Mar. 31, 2022
Notes Tables  
Schedule of Revenue by Major Customers by Reporting Segments [Table Text Block]
     

Three Months Ended March 31,

 

Count

   

2022

   

2021

 
1     $ 21,743     $ 54,300  
2       19,307       13,990  
3       18,855       11,359  
4       18,650       10,563  
5       14,936       9,583