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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]
   
Unrealized
    
Accumulated Other
  
   
(Losses) Gains on
    
Comprehensive
  
(Amounts in thousands)
  
Securities
    
(Loss) Income
 
Accumulated other comprehensive loss as of December 31, 2016
   $
(659
 )   $
(659
 )
Comprehensive income three months ended March 31, 2017
    
256
      
256
  
Comprehensive income three months ended June 30, 2017
    
915
      
915
  
Comprehensive loss three months ended September 30, 2017
    
(41
 )    
(41
 )
Accumulated other comprehensive income as of September 30, 2017
   $
471
     $
471
  
   
Unrealized
    
Unrealized
    
Accumulated Other
  
   
Gains on
    
Losses on
    
Comprehensive
  
(Amounts in thousands)
  
Securities
    
Derivatives
    
(Loss) Income
 
Accumulated other comprehensive income (loss) as of December 31, 2015
   $
1,142
     $
(1,396
 )   $
(254
 )
Comprehensive income three months ended March 31, 2016
    
50
      
1,396
      
1,446
  
Comprehensive income three months ended June 30, 2016
    
519
      
—
      
519
  
Comprehensive loss three months ended September 30, 2016
    
(222
 )    
—
      
(222
 )
Accumulated other comprehensive income as of September 30, 2016
   $
1,489
     $
—
     $
1,489