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Note 9 - Accumulated Other Comprehensive Income (Loss) (Tables)
 9 Months Ended
Sep. 30, 2017
Notes Tables  
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]
   
Available for Sale Securities
  
Balance a
t December 31, 2016
   $
(286
 )
Change in fair value
    
286
  
Balance at
September 30, 2017
   $
−
  
   
Available for Sale Securities
  
Balance a
t December 31, 2015
   $
(305
 )
Change in fair value
    
19
  
Balance at
September 30, 2016
   $
(286
 )