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Investments (Details) (USD $)
9 Months Ended 12 Months Ended
Sep. 30, 2012
Dec. 31, 2011
Summary of investments    
Cost $ 10,461,145 $ 12,827,614
Gross Unrealized Gains 101,053 38,502
Gross Unrealized Losses (7,232) (2,696)
Fair Market Value 10,554,966 12,863,420
Mutual funds [Member]
   
Summary of investments    
Contractual Maturity (in years) Less than 1 Less than 1
Cost 6,000,000 6,000,000
Gross Unrealized Gains 101,043 37,115
Gross Unrealized Losses      
Fair Market Value 6,101,043 6,037,115
Certificates of deposit [Member]
   
Summary of investments    
Contractual Maturity (in years) Less than 1 Less than 1
Cost 2,750,000 5,771,000
Gross Unrealized Gains 10   
Gross Unrealized Losses (342) (2,696)
Fair Market Value 2,749,668 5,768,304
Municipal bonds [Member]
   
Summary of investments    
Contractual Maturity (in years) Less than 1 Less than 1
Cost 1,711,145 1,056,614
Gross Unrealized Gains    1,387
Gross Unrealized Losses (6,890)   
Fair Market Value $ 1,704,255 $ 1,058,001