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Note 10 - Securities Sold Under Agreements to Repurchase (Tables)
 12 Months Ended
Dec. 31, 2017
Notes Tables  
Schedule of Repurchase Agreements [Table Text Block]
    Remaining Contractual Maturity of the Agreements
(In thousands)   Overnight and
Continuous		   Up to 30 Days   30-90 Days   Greater than
90 Days		   Total
December 31, 2017                    
Repurchase agreements:                                        
U.S. Government agencies   $
122,019
     $
--
     $
--
     $
--
     $
122,019
  
                                         
December 31, 2016                                        
Repurchase agreements:                                        
U.S. Government agencies   $
101,647
     $
--
     $
--
     $
757
     $
102,404