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Note 5 - Commitments and Contingencies (Tables)
12 Months Ended
Dec. 31, 2018
Notes Tables  
Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block]
2019
   
2020
   
2021
   
2022
   
2023
 
$ 564     $
404
    $
142
    $
-
    $
-
 
Schedule of Product Warranty Liability [Table Text Block]
   
2018
   
2017
 
Balance, January 1
  $
149
    $
172
 
Provision for warranties issued
   
7
     
84
 
Settlements made
   
(61
)    
(107
)
Balance, December 31
  $
95
    $
149