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Note 13 - Geographic Sales Information (Tables)
12 Months Ended
Dec. 31, 2018
Notes Tables  
Schedule of Revenue from External Customers and Long-Lived Assets, by Geographical Areas [Table Text Block]
   
Year ended December 31,
 
   
2018
   
2017
 
United States
  $
14,783
    $
24,569
 
All other countries
   
13,373
     
17,235
 
Total
  $
28,156
    $
41,804