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Note 15 - Foreign Revenues and Operations (Tables)
12 Months Ended
Dec. 31, 2017
Notes Tables  
Schedule of Revenue from External Customers and Long-Lived Assets, by Geographical Areas [Table Text Block]
Year ended December 31,
(in thousands)
 
2017
   
2016
 
European Union
  $
2,535
    $
2,383
 
United States
   
6,767
     
5,795
 
Total
  $
9,302
    $
8,178