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Note 9 - Fair Value (Tables)
6 Months Ended
Jun. 30, 2019
Notes Tables  
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Table Text Block]
   
Total Carrying
Amount in
Consolidated
Balance Sheet
June 30, 2019
   
Quoted Prices
in Active
Markets for
Identical
Assets
   
Trading Gaines
and Losses
   
Total Changes
in Fair Values
Included in
Current Period
Earnings (Loss)
 
                                 
Marketable equity securities
  $
12,022,361
    $
12,022,361
    $
415,572
    $
87,473
 
                                 
Securities available for sale
   
85,019,145
     
85,019,145
     
4,276
     
(36,957
)
                                 
     
 
     
 
    $
419,848
    $
50,516