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Note 14 - Accumulated Other Comprehensive Income (Loss) (Tables)
 9 Months Ended
Sep. 30, 2019
Notes Tables  
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]
   
Net Unrealized Gains (Losses) on Securities
    
Adjustments Related to Pension Benefits
    
Accumulated Other Comprehensive Income (Loss)
  
Balance at December 31, 2017
   $
(1,057
 )   $
99
     $
(958
 )
Unrealized holding losses (net of tax, ($443))
    
(1,667
 )    
—
      
(1,667
 )
Pension liability adjustment (net of tax, ($27))
    
—
      
(99
 )    
(99
 )
Change during period
    
(1,667
 )    
(99
 )    
(1,766
 )
Balance at September 30, 2018
   $
(2,724
 )   $
—
     $
(2,724
 )
Balance at December 31, 2018
   $
(1,808
 )   $
—
     $
(1,808
 )
Unrealized holding gains (net of tax, $875)
    
3,292
      
—
      
3,292
  
Unrealized holding losses transferred from held to maturity to available for sale (net of tax, ($91))
    
(340
 )    
—
      
(340
 )
Change during period
    
2,952
      
—
      
2,952
  
Balance at September 30, 2019
   $
1,144
     $
—
     $
1,144