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Note 9 - Fair Value (Tables)
3 Months Ended
Mar. 31, 2020
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
   
Realized Gains
   
Current Period
 
   
March 31, 2020
   
Assets
   
and (Losses)
   
Earnings (Loss)
 
                                 
Marketable equity securities, securities available for sale and corporate bonds
  $
60,235,714
    $
60,235,714
    $
23,984
    $
(24,745,513
)