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Note 9 - Commitments and Contingencies (Tables)
6 Months Ended
Jun. 30, 2020
Notes Tables  
Schedule of Product Warranty Liability [Table Text Block]
   

Six-month period ended June 30,

 
   

2020

   

2019

 

Accrued warranty obligations – beginning

  $ 195     $ 95  

Assumed warranty obligations

    -       145  

Accruals for warranties issued

    59       18  

Settlements made

    (26 )     (22 )

Accrued warranty obligations – ending

  $ 228     $ 236