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Note 6 - Accumulated Other Comprehensive Income (Tables)
 3 Months Ended
Mar. 31, 2019
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 December 31, 2018
   $
(154
 )
Other comprehensive income
    
795
  
Balance at March 31, 2019
   $
641
  
         
Balance as of December 31, 2017
   $
1,091
  
Other comprehensive loss
    
(1,510
 )
Change in accounting principle, ASC 2016-01
(b)
    
(141
 )
Change in accounting principle, ASC 2018-02
(b)
    
187
  
Period change
    
(1,464
 )
Balance at March 31, 2018
   $
(373
 )