Note 15 - Financial Instruments With Off-balance Sheet Risk (Tables)
 12 Months Ended
Dec. 31, 2016
Notes Tables  
Schedule of Fair Value, Off-balance Sheet Risks [Table Text Block]
December 31,
  
2016
    
2015
  
(In thousands)
  
Fixed Rate
    
Variable Rate
    
Fixed Rate
    
Variable Rate
  
Commitments to extend credit, including unused lines of credit
   $
71,369
     $
116,926
     $
61,188
     $
111,202
  
Standby letters of credit
    
2,284
      
1,769
      
2,495
      
7,999
  
Total
   $
73,653
     $
118,695
     $
63,683
     $
119,201