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Summary of Significant Accounting Policies (Tables)
9 Months Ended
Sep. 30, 2019
Summary of Significant Accounting Policies [Abstract]  
Fair Value of MSA Escrow Account
The following shows the fair value of the MSA escrow account:

  
As of September
30, 2019
  
As of December 31, 2018
 
  
Cost and
Estimated Fair
Value
  
Cost
  
Gross
Unrealized
Gains
  
Gross
Unrealized
Losses
  
Estimated
Fair
Value
 
Cash and cash equivalents
 
$
32,074
  
$
2,361

 
$
-
  
$
-
  
$
2,361

U.S. Governmental agency obligations (unrealized gain position < 12 months)
  
-
   
1,193
   
9
   
-
   
1,202
 
U.S. Governmental agency obligations (unrealized loss position < 12 months)
  
-
   
1,000
   
-
   
(3
)
  
997
 
U.S. Governmental agency obligations (unrealized loss position > 12 months)
  
-
   
27,519
   
-
   
(1,529
)
  
25,990
 
  
$
32,074
  
$
32,073
  
$
9
  
$
(1,532
)
 
$
30,550

Maturities of U.S. Governmental Agency Obligations
Fair value for the U.S. Governmental agency obligations are Level 2. The following shows the maturities of the U.S. Governmental agency obligations:

  
As of
 
  
December 31,
2018
 
Less than one year
 
$
1,499
 
One to five years
  
13,591
 
Five to ten years
  
11,152
 
Greater than ten years
  
3,470
 
Total U.S. Governmental agency obligations
 
$
29,712
 
Deposits by Sales Year for MSA Escrow Account
The following shows the amount of deposits by sales year for the MSA escrow account:


 
Deposits as of
 
Sales
Year
 
September
30, 2019
  
December 31,
2018
 
       
1999
 
$
211
  
$
211
 
2000
  
1,017
   
1,017
 
2001
  
1,673
   
1,673
 
2002
  
2,271
   
2,271
 
2003
  
4,249
   
4,249
 
2004
  
3,714
   
3,714
 
2005
  
4,553
   
4,552
 
2006
  
3,847
   
3,847
 
2007
  
4,167
   
4,167
 
2008
  
3,364
   
3,364
 
2009
  
1,619
   
1,619
 
2010
  
406
   
406
 
2011
  
193
   
193
 
2012
  
199
   
199
 
2013
  
173
   
173
 
2014
  
143
   
143
 
2015
  
101
   
101
 
2016
  
91
   
91
 
2017
  
83
   
83
 
         
Total
 
$
32,074
  
$
32,073