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Investments (Details) (USD $)									12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2012 Mutual funds [Member]	Dec. 31, 2011 Mutual funds [Member]	Dec. 31, 2012 Certificates of deposit [Member]	Dec. 31, 2011 Certificates of deposit [Member]	Dec. 31, 2012 Municipal bonds [Member]	Dec. 31, 2011 Municipal bonds [Member]	Dec. 31, 2012 Maximum [Member] Mutual funds [Member]	Dec. 31, 2012 Maximum [Member] Certificates of deposit [Member]	Dec. 31, 2012 Maximum [Member] Municipal bonds [Member]
Summary of investments
Contractual Maturity (in years)									1 year	1 year	1 year
Cost	$ 7,951,533	$ 12,827,614	$ 7,500,063	$ 6,000,000	$ 250,000	$ 5,771,000	$ 201,470	$ 1,056,614
Gross Unrealized Gains	83,868	38,502	83,868	37,115	0	0	0	1,387
Gross Unrealized Losses	(1,400)	(2,696)	0	0	0	(2,696)	(1,400)	0
Fair Market Value	$ 8,034,001	$ 12,863,420	$ 7,583,931	$ 6,037,115	$ 250,000	$ 5,768,304	$ 200,070	$ 1,058,001

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Available for sale securities contractual maturity.

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-Publisher FASB

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