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Note 6 - Accumulated Other Comprehensive Income (Tables)
6 Months Ended
Jun. 30, 2018
Notes Tables  
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]
(Dollars in thousands)  
Unrealized gains on
available-for-sale securities
(a)
 
Balance as of March 31, 2018
  $
(373
)
Other comprehensive loss before reclassification
   
(58
)
Balance at June 30, 2018
  $
(431
)
         
         
Balance as of December 31, 2017
  $
1,091
 
Other comprehensive loss before reclassification
   
(1,568
)
Change in accounting principle, ASC 2016-01
(b)
   
(141
)
Change in accounting principle, ASC 2018-02
(b)
   
187
 
Period change
   
(1,522
)
Balance at June 30, 2018
  $
(431
)
(Dollars in thousands)  
Unrealized gains on
available-for-sale securities
(a)
 
Balance as of March 31, 2017
  $
1,032
 
Other comprehensive income before reclassification
   
783
 
Amount reclassified from accumulated other comprehensive income
   
-
 
Period change
   
783
 
Balance at June 30, 2017
  $
1,815
 
         
         
Balance as of December 31, 2016
  $
1,201
 
Other comprehensive income before reclassification
   
936
 
Amount reclassified from accumulated other comprehensive income
   
(322
)
Period change
   
614
 
Balance at June 30, 2017
  $
1,815
 
Schedule of Amounts Recognized in Other Comprehensive Income (Loss) [Table Text Block]
   
Amount Reclassified from Accumulated Other Comprehensive Income
   
Affected Line Item in
the Statement Where
(Dollars in thousands)  
For the Six Months Ended
   
Net Income is
Details about other comprehensive income
 
June 30, 2018
   
June 30, 2017
   
Presented
Unrealized gains on available-for-sale securities (a)   $
-
    $
488
   
Investment securities gains on sale, net Income taxes
     
-
     
(166
)  
 
    $
-
    $
322