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Note 9 - Fair Value (Tables)
6 Months Ended
Jun. 30, 2018
Notes Tables  
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Table Text Block]
   
Total Carrying
   
Quoted Prices
   
 
 
 
 
Total Changes
 
   
Amount in
   
in Active
   
 
 
 
 
in Fair Values
 
   
Consolidated
   
Markets for
   
 
 
 
 
Included in
 
   
Balance Sheet
   
Identical
   
Trading Gains
   
Current Period
 
   
Jun. 30, 2018
   
Assets
   
and Losses
   
Earnings (Loss)
 
                                 
U.S. Treasury trading securities
  $
-
    $
-
    $
6,406
    $
(132,191
)
                                 
U.S. Treasury securities available for sale
   
150,346,440
     
150,346,440
     
44,354
     
245,494
 
                                 
     
 
     
 
    $
50,760
    $
113,303