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Note 13 - Stockholders' Equity (Tables)
 12 Months Ended
Dec. 31, 2018
Notes Tables  
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]
    Unrealized Gains
(Losses) on
Available for Sale
Securities		   Unrealized Gains
(Losses) on
Cash flow
Hedges		   Defined Benefit
Pension Items		   Fair Value
Option Elected
on Liabilities		   Total
December 31, 2018   (In thousands)
                     
Beginning balance, net of tax   $
(5,522
 )   $
231
     $
(3,695
 )   $
-
     $
(8,986
 )
Reclassification of the Income Tax Effects of the Tax Cuts and Jobs Act from AOCL to Retained Earnings    
(1,325
 )    
50
      
(798
 )    
-
      
(2,073
 )
Impact of adoption of Accounting Standard Update 2016-01    
-
      
-
      
-
      
779
      
779
  
                                         
Other comprehensive income before reclassifications, net of tax    
(10,127
 )    
3,351
      
2,484
      
87
      
(4,205
 )
                                         
Amounts reclassified from accumulated other comprehensive income (loss), net of tax    
1,325
      
72
      
336
      
-
      
1,733
  
                                         
Net current period other comprehensive income, net of tax    
(8,802
 )    
3,423
      
2,820
      
87
      
(2,472
 )
                                         
Ending balance, net of tax   $
(15,649
 )   $
3,704
     $
(1,673
 )   $
866
     $
(12,752
 )
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
 )    
105
      
485
      
(1,181
 )
                                 
Amounts reclassified from accumulated other comprehensive income (loss), net of tax    
108
      
126
      
323
      
557
  
                                 
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
 )
Reclassification out of Accumulated Other Comprehensive Income [Table Text Block]
For the year ended December 31, 2018
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:   $
(1,920
)
  
Net loss on sale of securities
     
595
 
  
Tax expense
    $
(1,325
)
  
Net of tax
             
Cash flow hedges:            
Interest rate swaps   $
(104
)
  
Interest expense
     
32
 
  
Tax expense
    $
(72
)
  
Net of tax
             
Amortization of defined benefit pension items:            
Actuarial losses   $
(530
)
(1)
  
Other operating expenses
Prior service credits    
39
(1)
  
Other operating expenses
     
(491
)
  
Total before tax
     
155
 
  
Tax expense
    $
(336
)
  
Net of tax
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
             
Cash flow hedges:            
Interest rate swaps   $
(184
)
  
Interest expense
     
58
 
  
Tax expense
    $
(126
)
  
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