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Investments (Schedule of Assets or Liabilities, Recurring Fair Value Measurements) (Details) - USD ($) | Sep. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cash & Cash Equivalents | $ 260,151,083 | $ 217,025,278
Market Value | 301,581,755 | 303,542,081
Investments and Cash | 561,732,838 | 520,567,359
Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cash & Cash Equivalents | 260,151,083 | 217,025,278
Investments and Cash | 411,422,193 | 369,544,350
Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cash & Cash Equivalents | 0 | 0
Investments and Cash | 150,310,645 | 151,023,009
Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cash & Cash Equivalents | 0 | 0
Investments and Cash | 0 | 0
Short-Term Investments | Certificates of Deposit |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Market Value | 150,299,384 | 150,299,384
Short-Term Investments | Certificates of Deposit | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Market Value | 150,299,384 | 150,299,384
Short-Term Investments | Certificates of Deposit | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Market Value | 0 | 0
Short-Term Investments | Certificates of Deposit | Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Market Value | 0 | 0
Short-Term Investments | Government Securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Market Value | 38,163,353 | 9,176,227
Short-Term Investments | Government Securities | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Market Value | 0 | 0
Short-Term Investments | Government Securities | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Market Value | 38,163,353 | 9,176,227
Short-Term Investments | Government Securities | Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Market Value | 0 | 0
Short-Term Investments | Corporate Bonds |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Market Value | 16,050,560 | 6,967,700
Short-Term Investments | Corporate Bonds | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Market Value | 0 | 0
Short-Term Investments | Corporate Bonds | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Market Value | 16,050,560 | 6,967,700
Short-Term Investments | Corporate Bonds | Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Market Value | 0 | 0
Short-Term Investments | Other |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Market Value | 971,726 | 2,219,688
Short-Term Investments | Other | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Market Value | 971,726 | 2,219,688
Short-Term Investments | Other | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Market Value | 0 | 0
Short-Term Investments | Other | Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Market Value | 0 | 0
Short-Term Investments | Municipal Bonds |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Market Value | 1,671,264 |
Short-Term Investments | Municipal Bonds | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Market Value | 0 |
Short-Term Investments | Municipal Bonds | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Market Value | 1,671,264 |
Short-Term Investments | Municipal Bonds | Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Market Value | 0 |
Long-Term Investments | Government Securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Market Value | 11,637,510 | 56,483,720
Long-Term Investments | Government Securities | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Market Value | 0 | 0
Long-Term Investments | Government Securities | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Market Value | 11,637,510 | 56,483,720
Long-Term Investments | Government Securities | Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Market Value | 0 | 0
Long-Term Investments | Corporate Bonds |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Market Value | 42,320,659 | 60,369,930
Long-Term Investments | Corporate Bonds | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Market Value | 0 | 0
Long-Term Investments | Corporate Bonds | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Market Value | 42,320,659 | 60,369,930
Long-Term Investments | Corporate Bonds | Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Market Value | 0 | 0
Long-Term Investments | Municipal Bonds |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Market Value | 40,467,299 | 18,025,432
Long-Term Investments | Municipal Bonds | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Market Value | 0 | 0
Long-Term Investments | Municipal Bonds | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Market Value | 40,467,299 | 18,025,432
Long-Term Investments | Municipal Bonds | Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Market Value | $ 0 | $ 0

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