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Fair Value Measurement of Assets and Liabilities (Details 1) (USD $) | Mar. 31, 2012 | Dec. 31, 2011
--- | --- | ---
Fair value of short and long-term investments classified as available for sale securities |  |
Gross Amortized Cost | $ 47,713,909 | $ 45,447,323
Gross Unrealized Gains | 1,492,863 | 1,573,927
Gross Unrealized Losses | (440,342) | (179,040)
Estimated Fair Value | 48,766,430 | 46,842,210
Short-term Investments [Member] |  |
Fair value of short and long-term investments classified as available for sale securities |  |
Gross Amortized Cost | 5,697,930 | 2,929,454
Gross Unrealized Gains | 59,289 | 322
Gross Unrealized Losses | (75,262) | (20,882)
Estimated Fair Value | 5,681,957 | 2,908,894
Long-term investments [Member] |  |
Fair value of short and long-term investments classified as available for sale securities |  |
Gross Amortized Cost | 42,015,979 | 42,517,869
Gross Unrealized Gains | 1,433,574 | 1,573,605
Gross Unrealized Losses | (365,080) | (158,158)
Estimated Fair Value | 43,084,473 | 43,933,316
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 | 1,776,034 | 1,554,448
Gross Unrealized Gains | 16,721 | 322
Gross Unrealized Losses | (12,902) |
Estimated Fair Value | 1,779,853 | 1,554,770
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 | 8,016,383 | 8,483,883
Gross Unrealized Gains | 418,169 | 669,910
Gross Unrealized Losses | (44,253) |
Estimated Fair Value | 8,390,299 | 9,153,793
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 | 3,921,896 | 1,375,006
Gross Unrealized Gains | 42,568 |
Gross Unrealized Losses | (62,360) | (20,882)
Estimated Fair Value | 3,902,104 | 1,354,124
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 | 16,296,878 | 16,386,974
Gross Unrealized Gains | 246,235 | 187,946
Gross Unrealized Losses | (109,984) | (104,713)
Estimated Fair Value | 16,433,129 | 16,470,207
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 | 17,702,718 | 17,647,012
Gross Unrealized Gains | 769,170 | 715,749
Gross Unrealized Losses | (210,843) | (53,445)
Estimated Fair Value | $ 18,261,045 | $ 18,309,316

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