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Note 5 - Property and Equipment (Tables)
6 Months Ended
Jun. 30, 2022
Notes Tables  
Property, Plant and Equipment [Table Text Block]
   

June 30,
2022

   

December 31,
2021

 

Equipment

  $ 5,027     $ 5,351  

Leasehold improvements

    1,607       1,531  

Software

    365       365  

Furniture and fixtures

    22       22  

Total property and equipment–at cost

    7,021       7,269  

Less: Accumulated depreciation

    (5,171 )     (5,026 )

Property and equipment, net

  $ 1,850     $ 2,243