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Fair Value of Financial Instruments - Fair Value of Assets (Details) (USD $)	Sep. 30, 2012	Dec. 31, 2011
Investments
Carrying value	$ 46,796,485	$ 91,356,624
Fair value of financial instruments	46,796,485	91,356,624
Fair value level	1,2	1,2
Cash and short term investments
Carrying value	78,140,931	38,606,556
Fair value of financial instruments	78,140,931	38,606,556
Fair value level	1	1
NotesReceivable
Carrying value	4,034,354	3,439,153
Fair value of financial instruments	$ 4,034,354	$ 3,439,153
Fair value level	3	3

The aggregate fair value as of the balance sheet date of financial instruments and other positions owned by the entity including: (1) mortgages, mortgage-backed and asset backed securities; (2) US government and agency obligations; (3) state and municipal government obligations; (4) other sovereign government debt; (5) corporate obligations; (6) corporate equities; (7) principal investments; (8) derivative contracts; and (9) physical commodities. Includes both pledged and unpledged holdings.

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