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Note 2 - Revenue (Tables)
9 Months Ended
Sep. 30, 2020
Notes Tables  
Revenue from External Customers by Products and Services [Table Text Block]
  

Three Months Ended September 30,

  

Nine Months Ended September 30,

 
  

2020

  

2019

  

2020

  

2019

 

Product sales

 $12,023  $15,732  $41,234  $56,355 

Administrative fees, freight and other

  2,316   1,468   4,854   4,713 

Less: sales returns

  (215)  (177)  (612)  (1,289)

Total net sales

 $14,124  $17,023  $45,476  $59,779