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Note 5 - Other Real Estate Owned (Tables)
 12 Months Ended
Dec. 31, 2019
Notes Tables  
Real Estate Investment Financial Statements, Disclosure [Table Text Block]
   
2019
    
2018
  
Balance at the beginning of year, gross
   $
—
     $
326
  
Transfers in
    
—
      
68
  
Sales proceeds
    
—
      
(416
 )
Gain on disposition
    
—
      
22
  
Balance at the end of year, gross
   $
—
     $
—
  
Less: valuation allowance
    
—
      
—
  
Balance at the end of year, net
   $
—
     $
—