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Note 14 - Foreign Revenues and Operations (Tables)
12 Months Ended
Dec. 31, 2016
Notes Tables  
Schedule of Revenue from External Customers and Long-Lived Assets, by Geographical Areas [Table Text Block]
Year ended December 31,
(in thousands)
 
201
6
 
 
201
5
 
Foreign Countries:
               
European Union
  $
2,383
    $
128
 
Other
   
--
     
4
 
Subtotal
   
2,383
     
132
 
United States
   
5,795
     
4,650
 
Total
  $
8,178
    $
4,782