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Note 2 - Revenue (Tables)
3 Months Ended
Mar. 31, 2021
Notes Tables  
Revenue from External Customers by Products and Services [Table Text Block]
  

Three Months Ended March 31,

 
  

2021

  

2020

 

Product sales

 $12,031  $14,011 

Administrative fees, freight and other

  1,554   1,084 

Less: sales returns

  (116)  (147)

Total net sales

 $13,469  $14,948