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Marketable Securities (Tables)
 9 Months Ended
Sep. 30, 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:
 
September 30, 2017
 
December 31, 2016
 
Level 1
 
Level 2
 
Total
 
Level 1
 
Level 2
 
Total
U.S. Agency issued mortgage-backed securities – variable rate
$
—

 
$
5,456,811

 
$
5,456,811

 
$
—

 
$
6,814,957

 
$
6,814,957

U.S. Agency notes and bonds – fixed rate
—

 
1,199,538

 
1,199,538

 
—

 
1,795,330

 
1,795,330

SBA loan pools – variable rate
—

 
1,398,668

 
1,398,668

 
—

 
1,346,824

 
1,346,824

Municipal bonds – VRDN
—

 
—

 
—

 
5,665,000

 
—

 
5,665,000

Total fair value of marketable securities
$
—

 
$
8,055,017

 
$
8,055,017

 
$
5,665,000

 
$
9,957,111

 
$
15,622,111