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Marketable Securities (Tables)
9 Months Ended
Sep. 30, 2015
Investments, Debt and Equity Securities [Abstract]  
Fair value of marketable securities, by type
The following table summarizes the fair value of our marketable securities, by level within the fair value hierarchy, as of each period end:
 
September 30, 2015
 
December 31, 2014
 
Level 1
 
Level 2
 
Total
 
Level 1
 
Level 2
 
Total
U.S. Treasury notes and bonds
$

 
$

 
$

 
$
1,338,010

 
$

 
$
1,338,010

U.S. Agency issued mortgage-backed securities – variable rate

 
4,691,254

 
4,691,254

 

 
4,003,375

 
4,003,375

U.S. Agency notes and bonds – fixed rate

 
3,257,977

 
3,257,977

 

 
3,251,336

 
3,251,336

SBA loan pools – variable rate

 
1,754,599

 
1,754,599

 

 
1,413,697

 
1,413,697

Municipal bonds – VRDN
4,735,000

 

 
4,735,000

 
4,835,000

 

 
4,835,000

Total fair value of marketable securities
$
4,735,000

 
$
9,703,830

 
$
14,438,830

 
$
6,173,010

 
$
8,668,408

 
$
14,841,418