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Note 7 - Property and Equipment, Net (Tables)
9 Months Ended
Sep. 30, 2021
Notes Tables  
Property, Plant and Equipment [Table Text Block]
   

Useful Life

                 

Asset Class

 

(Years)

   

September 30, 2021

   

December 31, 2020

 
                         

Operational equipment

    3 - 10     $ 867     $ 12,126  

Lab equipment

    5       498       524  

Computer equipment

    3       59       222  

Office furniture and equipment

    3       164       221  

Land

    -             1,047  

Building

    39             19,508  

Equipment under construction

            1,681       3,597  
              3,269       37,245  

Less: accumulated depreciation

            (1,447 )     (12,362 )
                         

Total property and equipment, net

          $ 1,822     $ 24,883