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Note 4 - Property and Equipment (Tables)
6 Months Ended
Jun. 30, 2022
Notes Tables  
Property, Plant and Equipment [Table Text Block]
  

June 30,

  

December 31,

  
  

2022

  

2021

 

Estimated Useful Life (Years)

Machinery and equipment

 $41  $42 

5

Trade show booth

  202   171 

5

Office equipment

  528   511 

5

Leasehold improvements

  178   380 

Lesser of lease term or estimated useful life

   949   1,104  

Accumulated depreciation

  (618)  (673) 
  $331  $431