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Fair Value Measurements of Financial Instruments (Detail) (USD $)	Jun. 30, 2012	Dec. 31, 2011
Fair Value Measurements [Line Items]
Financial Instruments, Owned, at Fair Value	$ 100,407,415	$ 108,729,835
Money Markets, Cash and Equivalents
Fair Value Measurements [Line Items]
Financial Instruments, Owned, at Fair Value	31,160,196	43,095,163
U.S. government and agency backed securities
Fair Value Measurements [Line Items]
Financial Instruments, Owned, at Fair Value	36,682,666	32,145,653
Corporate Debt
Fair Value Measurements [Line Items]
Financial Instruments, Owned, at Fair Value	13,622,465	18,754,992
Certificates of Deposit
Fair Value Measurements [Line Items]
Financial Instruments, Owned, at Fair Value	14,861,742	11,422,742
WIN Semiconductor Corporation
Fair Value Measurements [Line Items]
Financial Instruments, Owned, at Fair Value	1,563,126	1,709,189
Advanced Wireless Semiconductor Company
Fair Value Measurements [Line Items]
Financial Instruments, Owned, at Fair Value	2,517,220	1,602,096
Level 1
Fair Value Measurements [Line Items]
Financial Instruments, Owned, at Fair Value	52,756,397	59,299,118
Level 1 | Money Markets, Cash and Equivalents
Fair Value Measurements [Line Items]
Financial Instruments, Owned, at Fair Value	31,160,196	43,095,163
Level 1 | U.S. government and agency backed securities
Fair Value Measurements [Line Items]
Financial Instruments, Owned, at Fair Value	17,515,855	12,892,670
Level 1 | WIN Semiconductor Corporation
Fair Value Measurements [Line Items]
Financial Instruments, Owned, at Fair Value	1,563,126	1,709,189
Level 1 | Advanced Wireless Semiconductor Company
Fair Value Measurements [Line Items]
Financial Instruments, Owned, at Fair Value	2,517,220	1,602,096
Level 2
Fair Value Measurements [Line Items]
Financial Instruments, Owned, at Fair Value	47,651,018	49,430,717
Level 2 | U.S. government and agency backed securities
Fair Value Measurements [Line Items]
Financial Instruments, Owned, at Fair Value	19,166,811	19,252,983
Level 2 | Corporate Debt
Fair Value Measurements [Line Items]
Financial Instruments, Owned, at Fair Value	13,622,465	18,754,992
Level 2 | Certificates of Deposit
Fair Value Measurements [Line Items]
Financial Instruments, Owned, at Fair Value	$ 14,861,742	$ 11,422,742

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- Definition

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.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 940

-SubTopic 320

-Section 45

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6475986&loc=d3e42546-110969



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher AICPA

-Name Audit and Accounting Guide (AAG)

-Number AAG-BRD

-Paragraph 38, 40

-IssueDate 2006-05-01

-Chapter 4

-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.



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher AICPA

-Name Audit and Accounting Guide (AAG)

-Number AAG-BRD

-Paragraph 80

-Subparagraph Exhibit 4-3

-IssueDate 2006-05-01

-Chapter 4

-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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