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Note 15 - Financial Instruments With Off-balance Sheet Risk (Tables)
 12 Months Ended
Dec. 31, 2017
Notes Tables  
Schedule of Fair Value, Off-balance Sheet Risks [Table Text Block]
             
December 31,
  
201
7
    
201
6
  
(In thousands)
  
Fixed Rate
    
Variable Rate
    
Fixed Rate
    
Variable Rate
  
Commitments to extend credit, including unused lines of credit
   $
108,269
     $
111,603
     $
71,369
     $
116,926
  
Standby letters of credit
    
1,722
      
1,154
      
2,284
      
1,769
  
Total
   $
109,991
     $
112,757
     $
73,653
     $
118,695