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Investments (Details) (USD $)
3 Months Ended 12 Months Ended
Mar. 31, 2013
Dec. 31, 2012
Summary of investments    
Cost 7,900,063 7,951,533
Gross Unrealized Gains 78,837 83,868
Gross Unrealized Losses (555) (1,400)
Fair Market Value 7,978,345 8,034,001
Mutual funds [Member]
   
Summary of investments    
Cost 7,900,063 7,500,063
Gross Unrealized Gains 78,837 83,868
Gross Unrealized Losses (555) 0
Fair Market Value 7,978,345 7,583,931
Certificates of deposit [Member]
   
Summary of investments    
Cost   250,000
Gross Unrealized Gains   0
Gross Unrealized Losses   0
Fair Market Value   250,000
Municipal bonds [Member]
   
Summary of investments    
Cost   201,470
Gross Unrealized Gains   0
Gross Unrealized Losses   (1,400)
Fair Market Value   200,070
Maximum [Member] | Mutual funds [Member]
   
Summary of investments    
Contractual Maturity 1 year 1 year
Maximum [Member] | Certificates of deposit [Member]
   
Summary of investments    
Contractual Maturity   1 year
Maximum [Member] | Municipal bonds [Member]
   
Summary of investments    
Contractual Maturity   1 year