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Investments (Details) (USD $)	6 Months Ended	12 Months Ended
	Jun. 30, 2013	Dec. 31, 2012
Summary of investments
Cost	$ 13,191,964	$ 7,951,533
Gross Unrealized Gains	0	83,868
Gross Unrealized Losses	(84,185)	(1,400)
Fair Market Value	13,107,779	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	(84,185)	0
Fair Market Value	13,107,779	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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+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

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-Name FASB Staff Position (FSP)

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 115

-Paragraph 19

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



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-Publisher FASB

-Name Accounting Standards Codification

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-Name Statement of Financial Accounting Standard (FAS)

-Number 133

-Paragraph 22

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



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