Fair Value Measurement of Assets and Liabilities (Details 1) (USD $)	Sep. 30, 2011	Dec. 31, 2010
Fair value of short and long-term investments classified as available for sale securities
Gross Amortized Cost	$ 41,722,670	$ 38,776,370
Gross Unrealized Gains	1,559,721	648,744
Gross Unrealized Losses	(163,378)	(577,011)
Estimated Fair Value	43,119,013	38,848,103
Sovereign Debt Securities [Member] \| Short-term Investments [Member]
Fair value of short and long-term investments classified as available for sale securities
Gross Amortized Cost	1,733,173
Gross Unrealized Gains	3,035
Gross Unrealized Losses	0
Estimated Fair Value	1,736,208
Sovereign Debt Securities [Member] \| Long-term investments [Member]
Fair value of short and long-term investments classified as available for sale securities
Gross Amortized Cost	8,269,512	13,282,207
Gross Unrealized Gains	630,102	98,958
Gross Unrealized Losses	0	(233,926)
Estimated Fair Value	8,899,614	13,147,239
Corporate Debt Securities [Member] \| Short-term Investments [Member]
Fair value of short and long-term investments classified as available for sale securities
Gross Amortized Cost	384,983	398,752
Gross Unrealized Gains	0	26
Gross Unrealized Losses	(4,940)	(773)
Estimated Fair Value	380,043	398,005
Corporate Debt Securities [Member] \| Long-term investments [Member]
Fair value of short and long-term investments classified as available for sale securities
Gross Amortized Cost	14,312,659	10,987,910
Gross Unrealized Gains	172,068	110,521
Gross Unrealized Losses	(144,099)	(114,675)
Estimated Fair Value	14,340,628	10,983,756
Asset backed securities [Member] \| Long-term investments [Member]
Fair value of short and long-term investments classified as available for sale securities
Gross Amortized Cost	17,022,343	14,107,501
Gross Unrealized Gains	754,516	439,239
Gross Unrealized Losses	(14,339)	(227,637)
Estimated Fair Value	17,762,520	14,319,103
Short-term Investments [Member]
Fair value of short and long-term investments classified as available for sale securities
Gross Amortized Cost	2,118,156	398,752
Gross Unrealized Gains	3,035	26
Gross Unrealized Losses	(4,940)	(773)
Estimated Fair Value	2,116,251	398,005
Long-term investments [Member]
Fair value of short and long-term investments classified as available for sale securities
Gross Amortized Cost	39,604,514	38,377,618
Gross Unrealized Gains	1,556,686	648,718
Gross Unrealized Losses	(158,438)	(576,238)
Estimated Fair Value	$ 41,002,762	$ 38,450,098

For an unclassified balance sheet, total of debt securities categorized neither as held-to-maturity nor trading.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 45

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26610-111562

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 115

-Paragraph 12

-Subparagraph b

-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 FASB

-Name FASB Staff Position (FSP)

-Number FAS115-1/124-1

-Paragraph 15D

-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 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-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.

Reference 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name FASB Staff Position (FSP)

-Number FAS115-1/124-1

-Paragraph 15C

-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 6: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 115

-Paragraph 13

-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 7: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 320

-Section 50

-Paragraph 2

-Subparagraph (b)-(g)

-URI http://asc.fasb.org/extlink&oid=6957658&loc=d3e62557-112803

Reference 8: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 115

-Paragraph 137

-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 9: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 115

-Paragraph 16

-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 10: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 25

-Paragraph 1

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=6379932&loc=d3e22054-111558

+ Details