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Marketable Securities (Tables)
3 Months Ended
Mar. 31, 2017
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, 2017
 
December 31, 2016
 
Level 1
 
Level 2
 
Total
 
Level 1
 
Level 2
 
Total
U.S. Agency issued mortgage-backed securities – variable rate
$

 
$
6,762,947

 
$
6,762,947

 
$

 
$
6,814,957

 
$
6,814,957

U.S. Agency notes and bonds – fixed rate

 
1,799,973

 
1,799,973

 

 
1,795,330

 
1,795,330

SBA loan pools – variable rate

 
1,250,627

 
1,250,627

 

 
1,346,824

 
1,346,824

Municipal bonds – VRDN
5,665,000

 

 
5,665,000

 
5,665,000

 

 
5,665,000

Total fair value of marketable securities
$
5,665,000

 
$
9,813,547

 
$
15,478,547

 
$
5,665,000

 
$
9,957,111

 
$
15,622,111