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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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Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

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