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Note 15 - Accumulated Other Comprehensive Loss (Tables)
 12 Months Ended
Dec. 31, 2018
Notes Tables  
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]
   
Unrealized
Gains
(Losses)
On Securities
    
Changes in fair
value of derivative
contracts
designated as
hedge transactions
    
Adjustments
For Pension Plans
    
Total
Accumulated
Other
Comprehensive
Loss, Net
  
Balance January 1, 2016
   $
(1,159
)
   $
—
     $
(31,472
)
   $
(32,631
)
2016 change
    
2,613
      
(5,260
)
    
676
      
(1,971
)
Balance December 31, 2016
    
1,454
      
(5,260
)
    
(30,796
)
    
(34,602
)
2017 change
    
2,265
      
10,290
      
(1,326
)
    
11,229
  
Balance December 31, 2017
    
3,719
      
5,030
      
(32,122
)
    
(23,373
)
Change in accounting
    
(1,289
)
    
—
      
—
      
(1,289
)
2018 change
    
(2,443
 )    
(13,814
)
    
(1,550
)
    
(17,807
)
Balance December 31, 2018
   $
(13
 )   $
(8,784
)
   $
(33,672
)
   $
(42,469
)
   
Income Tax Effect of:
  
   
Unrealized
Gains
(Losses)
On Securities
    
Changes in fair
value of derivative
contracts
designated as
hedge transactions
    
Adjustments
For Pension Plans
    
Total
Accumulated
Other
Comprehensive
Loss, Net
  
Balance January 1, 2016
   $
631
     $
—
     $
10,630
     $
11,261
  
2016 change
    
(4
)
    
—
      
(510
)
    
(514
)
Balance December 31, 2016
    
627
      
—
      
10,120
      
10,747
  
2017 change
    
1,164
      
—
      
—
      
1,164
  
Balance December 31, 2017
    
1,791
      
—
      
10,120
      
11,911
  
2018 change
    
(1,791
 )    
—
      
2,455
      
664
  
Balance December 31, 2018
   $
—
     $
—
     $
12,575
     $
12,575