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Note 7 - Commitments and Contingencies (Tables)
6 Months Ended
Jun. 30, 2021
Notes Tables  
Lease, Cost [Table Text Block]
  

Three Months Ended June 30,

  

Six Months Ended June 30,

 
  

2021

  

2020

  

2021

  

2020

 

Lease cost:

                

Operating lease cost

 $29  $29  $58  $58 

Variable lease cost

  7   7   14   14 

Short-term lease cost

     4      9 

Total

 $36  $40  $72  $81