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Investments (Schedule of Amortized Cost, Unrealized Gains And Losses, And Market Value of Investment Securities) (Details) - USD ($) | Jun. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Cost | $ 309,398,439 | $ 196,926,043
Unrealized Gains | 48,196 | 10,562,267
Unrealized Losses | (320,134) | (367,837)
Market Value | 309,126,501 | 207,120,473
Short-Term Investments | Certificates of Deposit |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost | 160,003,990 | 130,000,000
Unrealized Gains | 13,675 | 0
Unrealized Losses | (25) | 0
Market Value | 160,017,640 | 130,000,000
Short-Term Investments | Corporate Bonds |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost | 3,011,806 | 12,952,229
Unrealized Gains | 0 | 0
Unrealized Losses | (11,085) | (7,230)
Market Value | 3,000,721 | 12,944,999
Short-Term Investments | Government Securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost | 6,693,257 | 9,024,777
Unrealized Gains | 280 | 0
Unrealized Losses | (1,712) | (13,647)
Market Value | 6,691,825 | 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 | 1,310,620 | 188,344
Unrealized Gains | 0 | 0
Unrealized Losses | 0 | 0
Market Value | 1,310,620 | 188,344
Long-Term Investments | Corporate Bonds |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost | 64,584,256 | 3,022,994
Unrealized Gains | 5,591 | 0
Unrealized Losses | (193,654) | (4,274)
Market Value | 64,396,193 | 3,018,720
Long-Term Investments | Government Securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost | 55,912,057 |
Unrealized Gains | 22,868 |
Unrealized Losses | (37,044) |
Market Value | 55,897,881 |
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 | Municipal Bonds |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost | 17,842,453 |
Unrealized Gains | 5,782 |
Unrealized Losses | (76,614) |
Market Value | $ 17,771,621 |
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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