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Note 8 - Commitments and Contingencies (Tables)
6 Months Ended
Jun. 30, 2021
Notes Tables  
Schedule of Product Warranty Liability [Table Text Block]
   

Six-month period ended June 30,

 
   

2021

   

2020

 

Accrued warranty obligations – beginning

  $ 149     $ 195  

Accruals for warranties issued

    121       59  

Settlements made

    (108 )     (26 )

Accrued warranty obligations – ending

  $ 162     $ 228