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Investments (Schedule of Amortized Cost, Unrealized Gains and Losses, and Market Value of Investment Securities) (Details) - USD ($) | Mar. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Cost | $ 295,692,106 | $ 269,889,067
Unrealized Gains | 4,899,312 | 1,974,255
Unrealized Losses | (732,888) | (587,564)
Market Value | 299,858,530 | 271,275,758
Short-Term Investments | Certificates of Deposit |  |
Debt Securities, Available-for-sale [Line Items] |  |
Cost | 50,099,795 | 50,099,795
Unrealized Gains | 0 | 0
Unrealized Losses | 0 | 0
Market Value | 50,099,795 | 50,099,795
Short-Term Investments | Government Securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Cost | 46,564,204 | 58,343,911
Unrealized Gains | 339,611 | 99,917
Unrealized Losses | 0 | (11,005)
Market Value | 46,903,815 | 58,432,823
Short-Term Investments | Corporate Bonds |  |
Debt Securities, Available-for-sale [Line Items] |  |
Cost | 29,047,745 | 29,025,624
Unrealized Gains | 84,838 | 194,061
Unrealized Losses | (10,181) | 0
Market Value | 29,122,402 | 29,219,685
Short-Term Investments | Other |  |
Debt Securities, Available-for-sale [Line Items] |  |
Cost | 2,867,906 | 2,631,750
Unrealized Gains | 0 | 0
Unrealized Losses | 0 | 0
Market Value | 2,867,906 | 2,631,750
Short-Term Investments | Municipal Bonds |  |
Debt Securities, Available-for-sale [Line Items] |  |
Cost | 2,079,998 |
Unrealized Gains | 4,123 |
Unrealized Losses | 0 |
Market Value | 2,084,121 |
Long-Term Investments | Certificates of Deposit |  |
Debt Securities, Available-for-sale [Line Items] |  |
Cost | 5,007,454 | 3,500,000
Unrealized Gains | 87,617 | 58,808
Unrealized Losses | (8,213) | (1,010)
Market Value | 5,086,858 | 3,557,798
Long-Term Investments | Asset-backed Securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Cost | 43,046,638 | 25,971,156
Unrealized Gains | 988,808 | 0
Unrealized Losses | (406,744) | (180,127)
Market Value | 43,628,702 | 25,791,029
Long-Term Investments | Government Securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Cost | 7,150,365 | 6,012,705
Unrealized Gains | 158,219 | 75,485
Unrealized Losses | 0 | 0
Market Value | 7,308,584 | 6,088,190
Long-Term Investments | Corporate Bonds |  |
Debt Securities, Available-for-sale [Line Items] |  |
Cost | 20,271,904 | 22,306,130
Unrealized Gains | 330,691 | 509,868
Unrealized Losses | (205,070) | 0
Market Value | 20,397,525 | 22,815,998
Long-Term Investments | Municipal Bonds |  |
Debt Securities, Available-for-sale [Line Items] |  |
Cost | 89,556,097 | 71,997,996
Unrealized Gains | 2,905,405 | 1,036,116
Unrealized Losses | (102,680) | (395,422)
Market Value | $ 92,358,822 | $ 72,638,690

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- Definition Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27161-111563 + Details
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- Definition Amount, before tax, of unrealized loss in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27161-111563 + Details
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