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Note 9 - 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 ended December 31,
(in thousands)
 
 
 
 
201
8
  $
331
 
201
9
   
268
 
20
20
   
252
 
2021
   
178
 
2022
   
44
 
Total minimum lease payments
  $
1,073