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Marketable Securities (Tables)
 3 Months Ended
Mar. 31, 2013
Investments, Debt and Equity Securities [Abstract]  
Fair value of marketable securities, by type
The following table summarizes the fair value of these marketable securities, by level within the fair value hierarchy, as of each period end:
 
March 31, 2013
 
December 31, 2012
 
Level 1
 
Level 2
 
Total
 
Level 1
 
Level 2
 
Total
U.S. Treasury notes and bonds
$
2,468,712

 
$
—

 
$
2,468,712

 
$
2,473,596

 
$
—

 
$
2,473,596

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

 
3,577,120

 
3,577,120

 
—

 
3,708,920

 
3,708,920

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

 
1,002,202

 
1,002,202

 
—

 
1,505,177

 
1,505,177

SBA loan pools – variable rate
—

 
1,930,776

 
1,930,776

 
—

 
1,988,443

 
1,988,443

Municipal bonds – VRDN
9,980,000

 
—

 
9,980,000

 
7,010,000

 
—

 
7,010,000

Total fair value of marketable securities
$
12,448,712

 
$
6,510,098

 
$
18,958,810

 
$
9,483,596

 
$
7,202,540

 
$
16,686,136