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Marketable Securities (Details) (USD $)
Jun. 30, 2013
Dec. 31, 2012
Fair value of marketable securities, by type    
Fair value of marketable securities $ 19,513,639 $ 16,686,136
U.S. Treasury notes and bonds
   
Fair value of marketable securities, by type    
Fair value of marketable securities 2,844,625 2,473,596
U.S. Agency issued mortgage-backed securities – variable rate
   
Fair value of marketable securities, by type    
Fair value of marketable securities 3,404,482 3,708,920
U.S. Agency notes and bonds – fixed rate
   
Fair value of marketable securities, by type    
Fair value of marketable securities 1,495,905 1,505,177
SBA loan pools – variable rate
   
Fair value of marketable securities, by type    
Fair value of marketable securities 1,893,627 1,988,443
Municipal bonds – VRDN
   
Fair value of marketable securities, by type    
Fair value of marketable securities 9,875,000 7,010,000
Level 1
   
Fair value of marketable securities, by type    
Fair value of marketable securities 12,719,625 9,483,596
Level 1 | U.S. Treasury notes and bonds
   
Fair value of marketable securities, by type    
Fair value of marketable securities 2,844,625 2,473,596
Level 1 | U.S. Agency issued mortgage-backed securities – variable rate
   
Fair value of marketable securities, by type    
Fair value of marketable securities 0 0
Level 1 | U.S. Agency notes and bonds – fixed rate
   
Fair value of marketable securities, by type    
Fair value of marketable securities 0 0
Level 1 | SBA loan pools – variable rate
   
Fair value of marketable securities, by type    
Fair value of marketable securities 0 0
Level 1 | Municipal bonds – VRDN
   
Fair value of marketable securities, by type    
Fair value of marketable securities 9,875,000 7,010,000
Level 2
   
Fair value of marketable securities, by type    
Fair value of marketable securities 6,794,014 7,202,540
Level 2 | U.S. Treasury notes and bonds
   
Fair value of marketable securities, by type    
Fair value of marketable securities 0 0
Level 2 | U.S. Agency issued mortgage-backed securities – variable rate
   
Fair value of marketable securities, by type    
Fair value of marketable securities 3,404,482 3,708,920
Level 2 | U.S. Agency notes and bonds – fixed rate
   
Fair value of marketable securities, by type    
Fair value of marketable securities 1,495,905 1,505,177
Level 2 | SBA loan pools – variable rate
   
Fair value of marketable securities, by type    
Fair value of marketable securities 1,893,627 1,988,443
Level 2 | Municipal bonds – VRDN
   
Fair value of marketable securities, by type    
Fair value of marketable securities $ 0 $ 0