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Note 4 - Commitments and Contingencies (Tables)
12 Months Ended
Dec. 31, 2018
Notes Tables  
Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block]
Year ending December 31,
 
Minimum
Lease Payments
 
2019
  $
284
 
2020
   
354
 
2021
   
358
 
2022 and thereafter
   
1,100
 
    $
2,096
 
Schedule of Future Minimum Lease Payments for Capital Leases [Table Text Block]
Year ending December 31,
 
Capital Lease
Obligations
 
2019
  $
62
 
2020
   
45
 
2021
   
21
 
2022 and thereafter
   
 
     
128
 
Less amounts representing interest
   
(6
)
    $
122