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Note 3 - Investments (Tables)
9 Months Ended
Sep. 30, 2018
Notes Tables  
Available-for-sale Securities [Table Text Block]
   
December 31, 2017
 
   
Amortized
cost
   
Unrealized+ loss
   
Fair value
 
Corporate bonds
  $
33,778
    $
(20
)
  $
33,758