Note 1 - Summary of Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2016
Notes Tables  
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]
Dollars in thousands
 
2016
 
 
2015
 
 
2014
 
Net unrealized gains (losses) on securities available for sale
 
$
(10,143
)
   $
(2,338
 )   $
(1,722
 )
Post retirement benefit obligations
 
 
(1,256
)
    
(1,226
 )    
(2,267
 )
Tax effect
 
 
3,876
 
    
1,212
     
1,356
 
Accumulated other comprehensive loss
 
$
(7,523
)
   $
(2,352
 )   $
(2,633
 )