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Fair Value of Financial Instruments (Tables)
 12 Months Ended
Dec. 31, 2017
Fair Value Disclosures [Abstract]  
Schedule of fair value of financial instruments by level in hierarchy
The following table summarizes the fair value of these marketable securities by level within the fair value hierarchy:
 
 
December 31, 2017
 
December 31, 2016
 
 
Level 1
 
Level 2
 
Total
 
Level 1
 
Level 2
 
Total
 
 
 
 
 
 
 
 
 
 
 
 
 
U.S. Agency issued mortgage-backed securities - variable rate
 
$
—

 
$
3,539,102

 
$
3,539,102

 
$
—

 
$
6,814,957

 
$
6,814,957

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

 
198,293

 
198,293

 
—

 
1,795,330

 
1,795,330

SBA loan pools - variable rate
 
—

 
935,081

 
935,081

 
—

 
1,346,824

 
1,346,824

Municipal bonds - VRDN
 
—

 
—

 
—

 
5,665,000

 
—

 
5,665,000

Total fair value of marketable securities
 
$
—

 
$
4,672,476

 
$
4,672,476

 
$
5,665,000

 
$
9,957,111

 
$
15,622,111