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Marketable Securities (Tables)
3 Months Ended
Mar. 31, 2016
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:
 
March 31, 2016
 
December 31, 2015
 
Level 1
 
Level 2
 
Total
 
Level 1
 
Level 2
 
Total
U.S. Agency issued mortgage-backed securities – variable rate
$

 
$
6,565,269

 
$
6,565,269

 
$

 
$
5,700,335

 
$
5,700,335

U.S. Agency notes and bonds – fixed rate

 
1,954,216

 
1,954,216

 

 
2,447,066

 
2,447,066

SBA loan pools – variable rate

 
1,611,733

 
1,611,733

 

 
1,681,714

 
1,681,714

Municipal bonds – VRDN
4,735,000

 

 
4,735,000

 
4,735,000

 

 
4,735,000

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

 
$
10,131,218

 
$
14,866,218

 
$
4,735,000

 
$
9,829,115

 
$
14,564,115