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Note 9 - Fair Value (Tables)
 12 Months Ended
Dec. 31, 2018
Notes Tables  
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Table Text Block]
   
Total Carrying
Amount in
Consolidated
Balance Sheet
Dec. 31, 2018
  
Quoted Prices
in Active
Markets for
Identical
Assets
  
Trading Gains
and Losses
  
Total Changes
in Fair Values
Included in
Current Period
Earnings (Loss)
                                 
Trading securities
   $
-
     $
-
     $
6,406
     $
(132,191
 )
                                 
Securities available for sale
    
86,845,386
      
86,845,386
      
739,589
      
116,796
  
                                 
     
 
      
 
     $
745,995
     $
(15,395
 )