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Note 11 - Equity Incentive Plan (Tables)
6 Months Ended
Jun. 30, 2021
Notes Tables  
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block]
  

Three Months Ended June 30,

  

Six Months Ended June 30,

 
  

2021

  

2020

  

2021

  

2020

 

Cost of revenue

 $214  $216  $343  $362 

Research and development

  402   156   643   352 

Selling, general and administrative

  2,181   1,868   4,070   1,319 

Total stock-based compensation expense

 $2,797  $2,240  $5,056  $2,033