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Investments (Details) (USD $) | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2013 | Dec. 31, 2012
Summary of investments |  |
Cost | $ 13,191,964 | $ 7,951,533
Gross Unrealized Gains | 0 | 83,868
Gross Unrealized Losses | (87,101) | (1,400)
Fair Market Value | 13,104,863 | 8,034,001
Mutual funds [Member] |  |
Summary of investments |  |
Cost | 13,191,964 | 7,500,063
Gross Unrealized Gains | 0 | 83,868
Gross Unrealized Losses | (87,101) | 0
Fair Market Value | 13,104,863 | 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, less than | 1 year | 1 year
Maximum [Member] | Certificates of deposit [Member] |  |
Summary of investments |  |
Contractual maturity, less than |  | 1 year
Maximum [Member] | Municipal bonds [Member] |  |
Summary of investments |  |
Contractual maturity, less than |  | 1 year

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