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Investments (Schedule of Amortized Cost, Unrealized Gains And Losses, And Market Value of Investment Securities) (Details) - USD ($) | Mar. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Cost | $ 152,252,568 | $ 196,926,043
Unrealized Gains | 0 | 10,562,267
Unrealized Losses | (33,160) | (367,837)
Market Value | 152,219,408 | 207,120,473
Short-Term Investments | Certificates of Deposit |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost | 130,000,000 | 130,000,000
Unrealized Gains | 0 | 0
Unrealized Losses | 0 | 0
Market Value | 130,000,000 | 130,000,000
Short-Term Investments | Corporate Bonds |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost | 15,919,177 | 12,952,229
Unrealized Gains | 0 | 0
Unrealized Losses | (27,360) | (7,230)
Market Value | 15,891,817 | 12,944,999
Short-Term Investments | Government Securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost | 6,009,310 | 9,024,777
Unrealized Gains | 0 | 0
Unrealized Losses | (5,800) | (13,647)
Market Value | 6,003,510 | 9,011,130
Short-Term Investments | Mutual Funds |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost |  | 392,482
Unrealized Gains |  | 1,575
Unrealized Losses |  | (476)
Market Value |  | 393,581
Short-Term Investments | Other |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost | 284,081 | 188,344
Unrealized Gains | 0 | 0
Unrealized Losses | 0 | 0
Market Value | 284,081 | 188,344
Long-Term Investments | Corporate Bonds |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost |  | 3,022,994
Unrealized Gains |  | 0
Unrealized Losses |  | (4,274)
Market Value |  | 3,018,720
Long-Term Investments | Mutual Funds |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost |  | 29,306,540
Unrealized Gains |  | 5,440,344
Unrealized Losses |  | (65,547)
Market Value |  | 34,681,337
Long-Term Investments | Common Stocks |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost | 40,000 | 10,897,219
Unrealized Gains | 0 | 5,079,815
Unrealized Losses | 0 | (273,663)
Market Value | $ 40,000 | 15,703,371
Long-Term Investments | Preferred Stock |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost |  | 1,141,458
Unrealized Gains |  | 40,533
Unrealized Losses |  | (3,000)
Market Value |  | $ 1,178,991

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- Definition Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale. + References Reference 1: 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=82897076&loc=d3e27161-111563 + Details
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- Definition Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 + Details
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