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Note 2 - Investments (Tables)
12 Months Ended
Dec. 31, 2016
Notes Tables  
Available-for-sale Securities [Table Text Block]
 
 
Amortized cost
 
 
Unrealized loss
 
 
Fair market value
 
Corporate bonds
  $
22,100
    $
(46
)
  $
22,054
 
Municipal bonds
   
3,727
     
(1
)
   
3,726
 
Agency bonds
   
3,339
     
(2
)
   
3,337
 
Total
  $
29,166
    $
(49
)
  $
29,117