v3.20.2
Note 10 - Stock-based Compensation (Tables)
9 Months Ended
Sep. 30, 2020
Notes Tables  
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block]
  

Three Months Ended
September 30,

  

Nine Months Ended
September 30,

 
  

2020

  

2019

  

2020

  

2019

 

Cost of goods sold

 $25  $68  $98  $197 

Research and development

  188   242   572   699 

Selling, general and administrative

  891   1,016   2,670   2,883 

Total

 $1,104  $1,326  $3,340  $3,779