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Note 4 - Commitments and Contingencies (Tables)
12 Months Ended
Dec. 31, 2017
Notes Tables  
Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block]
Year ending December
 31,
 
Minimum
Lease Payments
 
201
8
  $
321
 
201
9
   
305
 
2020
   
311
 
20
21 and thereafter
   
104
 
    $
1,041
 
Schedule of Future Minimum Lease Payments for Capital Leases [Table Text Block]
Year
 ending December 31,
 
Capital
 Lease
Obligations
 
201
8
  $
45
 
201
9
   
17
 
20
20
   
 
20
21 and thereafter
   
 
     
62
 
Less am
ounts representing interest
   
(1
)
    $
61