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Note 9 - Fair Value
3 Months Ended
Mar. 31, 2019
Notes to Financial Statements  
Fair Value Disclosures [Text Block]
NOTE
9.
     
FAIR VALUE
 
At
March 31, 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
   
Quoted Prices
   
 
 
 
 
Total Changes
 
   
Amount in
   
in Active
   
 
 
 
 
in Fair Values
 
   
Consolidated
   
Markets for
   
 
 
 
 
Included in
 
   
Balance Sheet
   
Identical
   
Trading Gains
   
Current Period
 
   
March 31, 2019
   
Assets
   
and Losses
   
Earnings (Loss)
 
                                 
Marketable equity securities
  $
5,477,223
    $
5,477,223
    $
120,584
    $
(44,018
)
                                 
Securities available for sale
   
87,513,353
     
87,513,353
     
-
     
(32,087
)
                                 
     
 
     
 
    $
120,584
    $
(76,105
)