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Note 9 - Accumulated Other Comprehensive Income (Loss) (Tables)
 3 Months Ended
Mar. 31, 2021
Notes Tables  
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]
(Dollar amounts in thousands)
  
Unrealized Gains and Losses on Available-for-Sale Securities
  
Defined Benefit Pension Items
  
Totals
Accumulated Other Comprehensive Income (Loss) at January 1, 2021
   $
2,220
 
   $
(5,704
)
   $
(3,484
)
Other comprehensive income before reclassification
    
(2,060
)
    
—
 
    
(2,060
)
Amounts reclassified from accumulated other comprehensive income (loss)
    
(20
)
    
—
 
    
(20
)
Net current period other comprehensive income (loss)
    
(2,080
)
    
—
 
    
(2,080
)
Accumulated Other Comprehensive Income (Loss) at March 31, 2021
   $
140
 
   $
(5,704
)
   $
(5,564
)
(Dollar amounts in thousands)
  
Unrealized Gains and Losses on Available-for-Sale Securities
  
Defined Benefit Pension Items
  
Totals
Accumulated Other Comprehensive Income (Loss) at January 1, 2020
   $
(108
)
   $
(5,227
)
   $
(5,335
)
Other comprehensive income before reclassification
    
1,259
 
    
—
 
    
1,259
 
Amounts reclassified from accumulated other comprehensive income (loss)
    
(62
)
    
—
 
    
(62
)
Net current period other comprehensive income (loss)
    
1,197
 
    
—
 
    
1,197
 
Accumulated Other Comprehensive Income (Loss) at March 31, 2020
   $
1,089
 
   $
(5,227
)
   $
(4,138
)
Reclassification out of Accumulated Other Comprehensive Income [Table Text Block]
(Dollar amounts in thousands)
  
Amount Reclassified
 
   
from Accumulated Other Comprehensive Income
 
Details about Accumulated Other Comprehensive (Income) Loss Components  
For the three months ended March 31, 2021
Affected Line Item in the Statement Where Net Income is Presented
Unrealized gains and losses on available-for-sale securities
   $
(26
)
Net gain on sale of available-for-sale securities
Tax effect
    
6
 
Provision for income taxes
Total reclassifications for the period
   $
(20
)
Net of tax
(Dollar amounts in thousands)
  
Amount Reclassified
 
   
from Accumulated Other Comprehensive Income
 
Details about Accumulated Other Comprehensive (Income) Loss Components  
For the three months ended March 31, 2020
Affected Line Item in the Statement Where Net Income is Presented
Unrealized gains and losses on available-for-sale securities
   $
(78
)
Net gain on sale of available-for-sale securities
Tax effect
    
16
 
Provision for income taxes
Total reclassifications for the period
   $
(62
)
Net of tax