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Note 13 - Financial Instruments With Off-balance Sheet Risk (Tables)
12 Months Ended
Dec. 31, 2020
Notes Tables  
Schedule of Fair Value, Off-balance Sheet Risks [Table Text Block]
   
(in thousands)
 
   
Contract amount
 
   
2020
   
2019
 
Commitments to extend credit
  $
155,745
    $
132,605
 
Letters of credit
  $
533
    $
615