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Note 9 - Fair Value
12 Months Ended
Dec. 31, 2018
Notes to Financial Statements  
Fair Value Disclosures [Text Block]
NOTE
9.
FAIR VALUE
 
At
December 31, 2018
and
2017,
our financial instruments included cash, cash equivalents, restricted cash, receivables, marketable securities, 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. U.S. Treasury trading 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 debt, level
1
in the fair value hierarchy.
 
   
Total Carrying
Amount in
Consolidated
Balance Sheet
Dec. 31, 2018
 
Quoted Prices
in Active
Markets for
Identical
Assets
 
Trading Gains
and Losses
 
Total Changes
in Fair Values
Included in
Current Period
Earnings (Loss)
                                 
Trading securities
  $
-
    $
-
    $
6,406
    $
(132,191
)
                                 
Securities available for sale
   
86,845,386
     
86,845,386
     
739,589
     
116,796
 
                                 
     
 
     
 
    $
745,995
    $
(15,395
)