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Investments (Schedule of Amortized Cost, Unrealized Gains And Losses, And Market Value of Investment Securities) (Details) (USD $) | Jun. 30, 2013 | Dec. 31, 2012
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Cost | $ 200,724,769 | $ 179,388,001
Unrealized Gains | 29,020,385 | 23,937,617
Unrealized Losses | (250,974) | (688,728)
Investments | 229,494,180 | 202,636,890
Short-Term Investments [Member] | Government Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost | 53,065,141 | 38,514,411
Unrealized Gains | 6,139 | 9,004
Unrealized Losses | (8,921) | (944)
Investments | 53,062,359 | 38,522,471
Short-Term Investments [Member] | U.S. Treasury Notes [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost | 28,274,980 | 15,018,810
Unrealized Gains | 5,971 | 2,602
Unrealized Losses | (1,711) | (1,062)
Investments | 28,279,240 | 15,020,350
Short-Term Investments [Member] | Corporate Bond Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost | 10,484,488 | 6,529,758
Unrealized Gains | 10,351 | 33,470
Unrealized Losses | (1,480) | 0
Investments | 10,493,359 | 6,563,228
Short-Term Investments [Member] | Other [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost | 420,413 | 185,926
Unrealized Gains |  | 0
Unrealized Losses |  | 0
Investments | 420,413 | 185,926
Short-Term Investments [Member] | Certificate Of Deposit [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost | 260,881 | 510,881
Unrealized Gains | 0 | 0
Unrealized Losses | 0 | 0
Investments | 260,881 | 510,881
Long-Term Investments [Member] | U.S. Treasury Notes [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost | 0 |
Unrealized Gains | 0 |
Unrealized Losses | 0 |
Investments | 0 |
Long-Term Investments [Member] | Corporate Bond Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost | 0 | 2,174,948
Unrealized Gains | 0 | 5,832
Unrealized Losses | 0 | 0
Investments | 0 | 2,180,780
Long-Term Investments [Member] | Common Stocks [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost | 34,990,852 | 40,893,121
Unrealized Gains | 11,684,312 | 12,781,501
Unrealized Losses | (199,744) | (391,421)
Investments | 46,475,420 | 53,283,201
Long-Term Investments [Member] | Mutual Funds - Equity [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost | 73,228,014 | 75,321,640
Unrealized Gains | 17,313,612 | 11,082,714
Unrealized Losses | (39,118) | (295,301)
Investments | 90,502,508 | 86,109,053
Long-Term Investments [Member] | Other - Equity [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost |  | 238,506
Unrealized Gains |  | 22,494
Unrealized Losses |  | 0
Investments |  | $ 261,000

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- Definition This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS115-1/124-1 -Paragraph 7 -Footnote 2 -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 Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 19 -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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- Definition This item represents the gross unrealized gains for securities, at a point in time, which are categorized neither as held-to-maturity nor trading securities. + References Reference 1: 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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27161-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 13, 19 -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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- Definition This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents investment securities as of the balance sheet date which may include marketable securities, derivative financial instruments, and investments accounted for under the equity method. + References Reference 1: 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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Available-for-Sale Securities -URI http://asc.fasb.org/extlink&oid=6505594 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 12 -Subparagraph a -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 Accounting Standards Codification -Glossary Trading Securities -URI http://asc.fasb.org/extlink&oid=6526789 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=7534914&loc=d3e22054-111558 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Subparagraph a, f, g -Article 7 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 35 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=16383099&loc=d3e24584-111560 + Details
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