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Note 9 - Accumulated Other Comprehensive Income (Loss) (Tables)
 6 Months Ended
Jun. 30, 2017
Notes Tables  
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]
   
Available
for Sale
Securities
  
Balance at December 31, 2016
   $
(286
 )
Change in fair value
    
286
  
Balance at June 30, 2017
   $
−
  
   
Available
for Sale
Securities
  
Balance at December 31, 2015
   $
(305
 )
Change in fair value
    
10
  
Balance at June 30, 2016
   $
(295
 )