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

2021

  

2020

 

Computer and office equipment

 $557  $557 

Furniture and fixtures

  130   130 

Land

  1,418   1,418 

Scientific equipment

  16,829   14,433 

Vehicle

  82   82 

Building

  22,773   21,013 

Mobile facility

  189   189 

Construction in process

  2,061   2,625 

Accumulated depreciation

  (15,731)  (13,111)
  $28,308  $27,336