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Note 4 - Property and Equipment, Net (Tables)
12 Months Ended
Dec. 31, 2021
Notes Tables  
Property, Plant and Equipment [Table Text Block]
  

December 31,

  

December 31,

 
  

2021

  

2020

 

Computer equipment and software

 $133  $159 

Laboratory and manufacturing equipment

  460   550 

Furniture and fixtures

  26   59 

Leasehold improvements

  26   332 

Construction in progress

  74   70 

Property and equipment, gross

  719   1,170 

Less accumulated depreciation

  (537)  (1,025)

Property and equipment, net

 $182  $145