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Note 13 - Stockholders' Equity (Tables)
 12 Months Ended
Dec. 31, 2017
Notes Tables  
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]
December 31, 2017   Unrealized Gains 
(Losses) on 
Available for Sale
Securities		   Unrealized Gains
(Losses) on 
Cash flow
Hedges		   Defined Benefit
Pension Items		   Total
    (In thousands)
Beginning balance, net of tax   $
(3,859
 )   $
-
     $
(4,503
 )   $
(8,362
 )
Other comprehensive income (loss) before reclassifications, net of tax    
(1,771
 )    
231
      
485
      
(1,055
 )
                                 
Amounts reclassified from accumulated other comprehensive income (loss), net of tax    
108
      
-
      
323
      
431
  
                                 
Net current period other comprehensive income (loss), net of tax    
(1,663
 )    
231
      
808
      
(624
 )
                                 
Ending balance, net of tax   $
(5,522
 )   $
231
     $
(3,695
 )   $
(8,986
 )
December 31, 2016   Unrealized Gains 
(Losses) on 
Available for Sale
Securities		   Defined Benefit
Pension Items		   Total
    (In thousands)
Beginning balance, net of tax   $
(521
 )   $
(5,041
 )   $
(5,562
 )
Other comprehensive income (loss) before reclassifications, net of tax    
(2,452
 )    
235
      
(2,217
 )
                         
Amounts reclassified from accumulated other comprehensive income (loss), net of tax    
(886
 )    
303
      
(583
 )
                         
Net current period other comprehensive income (loss), net of tax    
(3,338
 )    
538
      
(2,800
 )
                         
Ending balance, net of tax   $
(3,859
 )   $
(4,503
 )   $
(8,362
 )
December 31, 2015   Unrealized Gains 
(Losses) on 
Available for Sale
Securities		   Defined Benefit
Pension Items		   Total
    (In thousands)
Beginning balance, net of tax   $
3,392
     $
(6,299
 )   $
(2,907
 )
Other comprehensive income (loss) before reclassifications, net of tax    
(3,818
 )    
615
      
(3,203
 )
                         
Amounts reclassified from accumulated other comprehensive income (loss), net of tax    
(95
 )    
643
      
548
  
                         
Net current period other comprehensive income (loss), net of tax    
(3,913
 )    
1,258
      
(2,655
 )
                         
Ending balance, net of tax   $
(521
 )   $
(5,041
 )   $
(5,562
 )
Reclassification out of Accumulated Other Comprehensive Income [Table Text Block]
For the year ended December 31, 2017
Details about Accumulated Other
Comprehensive Income Components		   Amounts Reclassified from
Accumulated Other
Comprehensive Income		   Affected Line Item in the Statement
Where Net Income is Presented
(Dollars in thousands)
Unrealized gains (losses) on available  for sale securities:   $
(186
)
  
 Net loss on sale of securities 
     
78
 
  
 Tax expense 
    $
(108
)
  
 Net of tax 
             
             
Amortization of defined benefit pension items:            
Actuarial losses   $
(605
)
(1)
  
 Other operating expenses 
Prior service credits    
45
(1)
  
 Other operating expenses 
     
(560
)
  
Total before tax
     
237
 
  
 Tax expense 
    $
(323
)
  
 Net of tax 
For the year ended December 31, 2016
Details about Accumulated Other
Comprehensive Income Components		   Amounts Reclassified from
Accumulated Other
Comprehensive Income		   Affected Line Item in the Statement
Where Net Income is Presented
(Dollars in thousands)
Unrealized gains (losses) on available for sale securities:   $
1,524
 
  
 Net gain on sale of securities
     
(638
)
  
 Tax expense
    $
886
 
  
 Net of tax
             
             
Amortization of defined benefit pension items:            
Actuarial losses   $
(568
)
(1)
  
 Other operating expenses
Prior service credits    
45
(1)
  
 Other operating expenses
     
(523
)
  
Total before tax
     
220
 
  
 Tax benefit
    $
(303
)
  
 Net of tax
For the year ended December 31, 2015
Details about Accumulated Other
Comprehensive Income Components		   Amounts Reclassified from
Accumulated Other
Comprehensive Income		   Affected Line Item in the Statement
Where Net Income is Presented
(Dollars in thousands)
Unrealized gains (losses) on available  for sale securities:   $
167
 
  
 Net gain on sale of securities
     
(72
)
  
 Tax expense
    $
95
 
  
 Net of tax
             
             
Amortization of defined benefit pension items:            
Actuarial losses   $
(1,178
)
(1)
  
 Other operating expenses
Prior service credits    
46
(1)
  
 Other operating expenses
     
(1,132
)
  
Total before tax
     
489
 
  
 Tax benefit
    $
(643
)
  
 Net of tax