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Note 11 - Commitments and Contingencies (Tables)
12 Months Ended
Dec. 31, 2019
Notes Tables  
Schedule of Fair Value, Off-balance Sheet Risks [Table Text Block]
   
December 31,
 
   
2019
   
2018
 
   
(In Thousands)
 
Commitments to extend credit
  $
142,785
    $
111,460
 
Letters of credit
   
3,098
     
3,925