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Investments (Schedule of Assets or Liabilities, Recurring Fair Value Measurements) (Details) - USD ($) | Mar. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cash & Cash Equivalents | $ 221,688,575 | $ 217,025,278
Market Value | 302,741,730 | 303,542,081
Investments and Cash | 524,430,305 | 520,567,359
Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cash & Cash Equivalents | 221,688,575 | 217,025,278
Investments and Cash | 374,909,241 | 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 | 149,521,064 | 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 | Corporate Bonds |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Market Value | 5,982,688 | 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 | 5,982,688 | 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 | Government Securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Market Value | 21,109,868 | 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 | 21,109,868 | 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 | Other |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Market Value | 2,921,282 | 2,219,688
Short-Term Investments | Other | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Market Value | 2,921,282 | 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
Long-Term Investments | Corporate Bonds |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Market Value | 66,610,295 | 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 | 66,610,295 | 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 | Government Securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Market Value | 34,534,506 | 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 | 34,534,506 | 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 | Municipal Bonds |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Market Value | 21,283,707 | 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 | 21,283,707 | 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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