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Note 4 - Investment Securities (Tables)
12 Months Ended
Dec. 31, 2019
Notes Tables  
Debt Securities, Available-for-sale [Table Text Block]
   
December 31,
   
December 31,
 
   
2019
   
2018
 
   
Fair value
   
Cost
   
Fair value
   
Cost
 
JPMorgan Managed Income Fund
  $
62,207
    $
62,178
    $
72,453
    $
72,567