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Note 15 - Commitments and Contingencies (Tables)
12 Months Ended
Dec. 31, 2017
Notes Tables  
Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block]
     
(in thousands)
 
         
201
8
  $
382
 
201
9
   
67
 
20
20
   
36
 
20
21
   
6
 
20
22 and thereafter
   
-
 
         
Total
  $
491