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Note 6 - Accumulated Other Comprehensive Income (Loss) (Tables)
3 Months Ended
Mar. 31, 2020
Notes Tables  
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]
(Dollars in thousands)   
Unrealized gains/(losses)
on available-for-sale
securities (a)
 
Balance as of December 31, 2018
  $
(154
)
Other comprehensive income
   
795
 
Balance at March 31, 2019
  $
641
 
         
Balance as of December 31, 2019
  $
1,842
 
Other comprehensive (loss)
   
(4,079
)
Balance at March 31, 2020
  $
(2,237
)