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Investments (Schedule of Assets or Liabilities, Recurring Fair Value Measurements) (Details) - USD ($) | Jun. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cash & Cash Equivalents | $ 353,032,803 | $ 423,371,036
Market Value | 198,213,136 | 185,166,292
Total | 551,245,939 | 608,537,328
Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cash & Cash Equivalents | 353,032,803 | 423,371,036
Total | 358,857,782 | 430,062,110
Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cash & Cash Equivalents | 0 | 0
Total | 192,388,157 | 178,475,218
Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cash & Cash Equivalents | 0 | 0
Total | 0 | 0
Short-Term Investments | Certificate of Deposit |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Market Value | 1,511,377 | 1,516,693
Short-Term Investments | Certificate of Deposit | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Market Value | 1,511,377 | 1,516,693
Short-Term Investments | Certificate of Deposit | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Market Value | 0 | 0
Short-Term Investments | Certificate 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 | 2,020,280 | 7,155,600
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 | 2,020,280 | 7,155,600
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 | 602,016 | 6,678,450
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 | 602,016 | 6,678,450
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 | Municipal Bonds |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Market Value | 7,951,512 | 10,284,765
Short-Term Investments | Municipal Bonds | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Market Value | 0 | 0
Short-Term Investments | Municipal Bonds | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Market Value | 7,951,512 | 10,284,765
Short-Term Investments | Municipal 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 | 1,713,642 | 1,528,861
Short-Term Investments | Other | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Market Value | 1,713,642 | 1,528,861
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 | Asset Backed Securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Market Value | 29,174,900 | 37,924,537
Long-Term Investments | Asset Backed Securities | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Market Value | 0 | 0
Long-Term Investments | Asset Backed Securities | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Market Value | 29,174,900 | 37,924,537
Long-Term Investments | Asset Backed Securities | Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Market Value | 0 | 0
Long-Term Investments | Certificate of Deposit |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Market Value | 2,599,960 | 3,645,520
Long-Term Investments | Certificate of Deposit | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Market Value | 2,599,960 | 3,645,520
Long-Term Investments | Certificate of Deposit | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Market Value | 0 |
Long-Term Investments | Certificate of Deposit | 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 | 27,966,498 | 9,024,035
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 | 27,966,498 | 9,024,035
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 | 35,738,826 |
Long-Term Investments | Government Securities | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Market Value | 0 |
Long-Term Investments | Government Securities | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Market Value | 35,738,826 |
Long-Term Investments | Government Securities | Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Market Value | 0 |
Long-Term Investments | Municipal Bonds |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Market Value | 88,934,125 | 107,407,831
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 | 88,934,125 | 107,407,831
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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