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Fair Value Measurements of Financial Instruments (Detail) (USD $) | Jun. 30, 2012 | Dec. 31, 2011
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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. + Details
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