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Note 9 - Fair Value
6 Months Ended
Jun. 30, 2018
Notes to Financial Statements  
Fair Value Disclosures [Text Block]
NOTE
9.
FAIR VALUE
 
At
June 30, 2018
and
December 31, 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 investments held at cost 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
   
Quoted Prices
   
 
 
 
 
Total Changes
 
   
Amount in
   
in Active
   
 
 
 
 
in Fair Values
 
   
Consolidated
   
Markets for
   
 
 
 
 
Included in
 
   
Balance Sheet
   
Identical
   
Trading Gains
   
Current Period
 
   
Jun. 30, 2018
   
Assets
   
and Losses
   
Earnings (Loss)
 
                                 
U.S. Treasury trading securities
  $
-
    $
-
    $
6,406
    $
(132,191
)
                                 
U.S. Treasury securities available for sale
   
150,346,440
     
150,346,440
     
44,354
     
245,494
 
                                 
     
 
     
 
    $
50,760
    $
113,303