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Fair Value of Financial Instruments (Tables)
12 Months Ended
Dec. 31, 2012
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, as of December 31, 2012:
 
 
Level 1
 
Level 2
 
Total
 
 
 
 
 
 
 
U.S. Treasury notes and bonds
 
$
2,473,596

 
$

 
$
2,473,596

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

 
3,708,920

 
3,708,920

U.S. Agency notes and bonds - fixed rate
 

 
1,505,177

 
1,505,177

SBA loan pools - variable rate
 

 
1,988,443

 
1,988,443

Municipal bonds - VRDN
 
7,010,000

 

 
7,010,000

Total fair value of marketable securities
 
$
9,483,596

 
$
7,202,540

 
$
16,686,136