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Note 8 - Stock-based Compensation (Tables)
6 Months Ended
Jun. 30, 2022
Notes Tables  
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block]
  

Three Months Ended June 30,

  

Six Months Ended June 30,

 
  

2022

  

2021

  

2022

  

2021

 

Cost of revenues

 $7  $34  $14  $68 

Research and development expenses

  13   84   26   195 

Selling, general and administrative expenses

  16   185   48   458 
  $36  $303  $88  $721