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Note 9 - Fair Value
6 Months Ended
Jun. 30, 2019
Notes to Financial Statements  
Fair Value Disclosures [Text Block]
NOTE
9.
     
FAIR VALUE
 
At
June 30, 2019
and
December 31, 2018,
our financial instruments included cash, cash equivalents, restricted cash, receivables, marketable equity securities, certain investments, and accounts payable. The fair values of cash, cash equivalents, restricted cash, receivables, and accounts payable approximated carrying values because of the short-term nature of these instruments. Marketable equity securities and U.S. Treasury securities available for sale are reported at fair values. Fair values for equity investments in private companies are
not
readily available, but are estimated to approximate fair value. Substantially all of the fair value is determined using observed prices of publicly traded securities, level
1
in the fair value hierarchy.
 
   
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